PCI-COMM Series Industrial Serial Communication Cards User Manual
Copyright The documentation and the software included with this product are copyrighted 2008 by Advantech Co., Ltd. All rights are reserved. Advantech Co., Ltd. reserves the right to make improvements in the products described in this manual at any time without notice. No part of this manual may be reproduced, copied, translated or transmitted in any form or by any means without the prior written permission of Advantech Co., Ltd. Information provided in this manual is intended to be accurate and reliable.
Product Warranty (2 years) Advantech warrants to you, the original purchaser, that each of its products will be free from defects in materials and workmanship for two years from the date of purchase. This warranty does not apply to any products which have been repaired or altered by persons other than repair personnel authorized by Advantech, or which have been subject to misuse, abuse, accident or improper installation.
CE This product has passed the CE test for environmental specifications when shielded cables are used for external wiring. We recommend the use of shielded cables. This kind of cable is available from Advantech. Please contact your local supplier for ordering information. FCC Class A This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules.
Technical Support and Assistance Step 1. Visit the Advantech web site where you can find the latest information about the product. Step 2. Contact your distributor, sales representative, or Advantech's customer service center for technical support if you need additional assistance. Please have the following information ready before you call: - Product name and serial number - Description of your peripheral attachments - Description of your software (operating system, version, application software, etc.
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Contents Chapter 1 Introduction ..................................................... 2 1.1 1.2 1.3 1.4 Chapter Description ........................................................................ 2 Features ............................................................................. 3 Specifications .................................................................... 3 Ordering Information ........................................................ 5 1.4.1 Accessories ...................................
Figure 2.26:Passive Mode Jumper Setting .................. 33 Figure 2.27:Resistor Selection ..................................... 34 2.4 Chapter Chapter Card Installation .............................................................. 35 3 Driver Setup & Installation.......................... 38 3.1 3.2 Introduction ..................................................................... 38 Driver Setup .................................................................... 38 3.
5.1 5.2 Pin assignments ............................................................... 74 5.1.1 PCI-1601A/AU/B/BU, PCI-1602A/AU/B/BU ............ 74 Table 5.1:PCI-1601/1602 Male DB9 on bracket ......... 74 Figure 5.1:PCI-1601/1602 Pin Assignment ................. 74 5.1.2 PCI-1602UP ................................................................. 75 Table 5.2:PCI-1602UP Male DB9 on cable ................ 75 Table 5.3:PCI-1602UP Female DB25 on bracket ....... 75 5.1.3 PCI-1603 .........................
5.2.2 5.2.3 Table 5.28:Terminal or PC (DTE) Connections .......... 92 Table 5.29:Modem Connections .................................. 93 Table 5.30:Terminal without Handshake ..................... 93 RS-422 Signal Wiring .................................................. 94 Table 5.31:RS-422 DB9 Pin Assignment .................... 94 RS-485 Signal Wiring .................................................. 95 Figure 5.2:RS-485 Wiring Topology ...........................
CHAPTER 1 2 Introduction This chapter provides detailed specifications for the PCI COMMUNICATION cards.
Chapter 1 Introduction 1.1 Description The PCI Local Bus is a high-performance bus that provides a processorindependent data path between the CPU and high-speed peripherals. PCI is a robust inter-connect mechanism designed specifically to accommodate multiple high performance peripherals for series communication, SCSI, LAN, etc. Advantech serial communication card leverages the " Plug and Play " capability defined in the PCI 2.1/2.2 bus specification.
1.2 Features • PCI Specification 2.1/2.2 compliant • Speeds up to 921.6 kbps • 16PCI952/954 , 16C954 UARTs with 128-byte FIFOs standard • I/O address automatically assigned by PCI plug-and play • OS supported: Windows 98/ME/2000/XP, Linux • Optional surge protection • Optional isolation protection for RS-232/422/485 • Interrupt status register for increased performance • Space reserved for termination resistors • Automatic RS-485 data flow control • Utility-ICOM Tools 1.
• Speed (bps) : PCI-1603: RS-232: 50~203.4k Current Loop: 50~57.6k Others: 50 ~ 921.
• Operating Temperature: 0~ 65° C (See IEC 68-2-1, 2), (32~149° F) • Operating Humidity: 5 ~ 95% Relative Humidity, non-condensing (See IEC 68-2-3) • Storage Temperature: -25 ~ 85° C (-13~185° F) • Current-loop Interface Signal Driver/receiver: 6N136 Signals: TxD+, TxD-, RxD+, RxD• Current Value: 20mA (Standard) • Mode: Asynchronous, full duplex • Baud-rate: 50 ~ 57600 bps • Transmission Distance: 1000 m 1.4 Ordering Information • PCI-1601A: 2-port RS-422/485 PCI Comm.
• PCI-1610AJU: 4-port RS-232 Universal PCI Comm. Card w/ RJ45 connector • PCI-1610AUP: 4-port RS-232 Low-Profile Universal PCI Comm. Card • PCI-1610B: 4-port RS-232 PCI Comm. Card, w/surge protection • PCI-1610CU: 4-port RS-232 Universal PCI Comm. Card, w/isolation and surge protection • PCI-1610UP: 4-port RS-232 Low-Profile Universal PCI Comm. Card, w/surge protection • PCI-1611U: 4-port RS-422/485 Universal PCI Comm. Card, w/isolation and surge protection • PCI-1612A: 4-port RS-232/422/485 PCI Comm.
1.4.
Table 1.1: PCI Communication Cards Selection Guide Model Name PCI-1601 PCI-1602 A B - AU BU Ports Comm.
CHAPTER 2 2 Hardware Configuration This chapter provides information on the hardware configuration of PCI COMMUNICATION cards.
Chapter 2 Hardware Configuration 2.1 Initial Inspection You should find the following items inside the shipping package: PCI communication interface card Industrial Communication Driver, Utility and PCI communication card user manual in ICOM CD-ROM We carefully inspected the PCI communication card series mechanically and electrically before we shipped it. It should be free of marks and scratches and in perfect working order on receipt.
2.2 Jumper and Switch Locations Figure 2.
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2.3 Jumper Settings This section tells how to set the jumpers to configure your card. It gives the card default configuration and your options for each jumper. 2.3.1 How to Set Jumpers You configure your card to match the needs of your application by setting jumpers. A jumper is the simplest kind of electric switch. It consists of two metal pins and a small metal clip (often protected by a plastic cover) that slides over the pins to connect them. To “close” a jumper you connect the pins with the clip.
2.3.2 Default Settings The board is shipped with default settings. If you need to change these settings, however, see the following sections. Otherwise, you can simply install the card. PCI-1601/1602/1611/1612/1622. Table 2.1: PCI-1601/1602/1611/1612/1622 Default Setting RS-422/485 Mode RS-422 Auto Enable Mode PCI-1603 The board will be shipped in the RS-232 mode, passive Rx and active Tx. On the 10*2 pin jumper groups (JP2 & JP4)— A, B, C, D and E are set to RS-232 transmission mode.
2.3.3 Mode Selection by Jumper/DIP Settings RS-232/422/485 Selection (for PCI-1612A/B/AU/U/CU) Should you wish to configure the PCI-1612A/B/AU/U/CU to operate in the RS-232 mode, the bottom two pins of the 12*3 pin jumper should be connected. For RS-422/ RS-485 mode selection, the upper two pins of the 12*3 pin jumper should be connected as shown below. Figure 2.
PCI-1603 RS-232/Current-loop Mode Selection For RS-232 mode operations, the jumpers will be set as the default mode. The jumpers on the 10*2 pin jumper must be set to A, B, C, D and E. Figure 2.23: PCI-1603 RS-232 Mode Jumper Setting To enable the channel to operate in the current-loop mode, you should set F, G, H, I and J on the 10*2 pin jumpers. Figure 2.24: PCI-1603 Current-loop Mode Jumper Setting Then decide which mode the Tx and Rx will operate in. The options are active or passive.
C and D are set to be passive Rx, and F is set to be passive Tx. Figure 2.26: Passive Mode Jumper Setting You may configure both Tx and Rx on one port to operate in the same mode, or you can configure each Tx and Rx on one port to operate in different modes.
Terminator resistor setup (for PCI-1601/1602/1611/1612/1622) You can install terminator resistors if necessary to match impedance. Each signal line (Tx, Rx) has a separate resistor. Especially in fields with serious electric noise, installing terminal resistors is helpful to stabilize communications. Make sure that both sides of the RS-485 communication ports are installed on BUS. See details in Chapter 5.2.2 and 5.2.3 Figure 2.
2.4 Card Installation Note: We strongly recommend that you install the software driver before you install the hardware into your system, since this will guarantee a smooth and trouble-free installation process. Turn off your PC’s power supply whenever you install or remove the PCI communication card or its cables. Static electricity can easily damage computer equipment. Ground yourself by touching the chassis of the computer (metal) before you touch any boards. See the static warning on Ch.2 1.
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CHAPTER 3 2 Driver Setup and Installation This chapter describes the driver installation, configuration and removal procedures for the Windows operating system, including Windows 98/2000/ XP.
Chapter 3 Driver Setup & Installation 3.1 Introduction This chapter describes the driver installation, configuration and removal procedures for the Windows operating system, including Windows 98/ NT/2000/XP. We strongly recommend that you install the software driver before you install the hardware into your system, since this will guarantee a smooth and trouble-free installation process. 3.2 Driver Setup Windows 98/2000/XP supports COM1 to COM256, meaning up to 256 serial ports.
3. After the setup program is launched, you’ll see the following Screen. 4. Click the Continue button and the catalogue select page appears.
5. Choose the driver you want to install, then click the hyperlink. 6. Click Next to continue installation.
7. Type user name and company name, then click Next. 8. Just click Next to accept the default installation folder, or you can specify a folder by clicking the Browse button.
9. Select a program folder or type a new folder name. 10. Click Back to review or change your setting, or click Next to begin copying files.
11. Perfom the requested operations and select Finish.
3.3 Reboot System after Win98/2000/XP Driver Setup 3.3.1 PCI UARTs Device Driver Installation 1. When you reboot your system, Windows 98/2000/XP will recognize your card devices and will automatically search for the device driver for PCI UARTs as shown in the following dialog box. 2. Choose “Search for the best driver for your device” radio button, and click Next.
3. You don’t have to choose the location of the device driver program, since it is already installed on your system. Just click Next to proceed. 4. Windows 98/2000/XP has found the driver location and is ready to install the driver. Click Next.
5. The driver installation is complete. Click Finish. 3.3.2 PCI Bridge Device Driver Installation After the PCI UARTs device driver has been installed, Windows 98/ 2000/XP will recognize the PCI Bridge device and automatically install the device driver for PCI Bridge.
3.4 Verify your Win98/2000/XP Driver Setup After you have installed your card, go to Control Panel/System/Device Manager to look for the Device Name that will appear after you have installed the driver. Note: If your device has not been properly installed, there will be an exclamation mark (!) on the device name to indicate a conflicting device. If this is the case, just remove that device and start the driver installation process all over again.
You can also check the COM Port properties by double-clicking the specific com port device configuration you want to see. On the Properties sheet, select the specific tabs to see relevant information. On the General tab, you can see whether the device is working properly. If your device functions normally, you can see a message under the Device status box, stating “This device is working properly”.
On the Settings tab, you can view relevant information about that specific port, as you can see on the figures below.
If you want to configure FIFO Properties, select the FIFOs tab. On the tab, you can see the relevant FIFO configurations. We recommend you use the default settings. However, you can set the configurations manually according to your preferences. If you want to restore the default settings, just click the Restore Default button. 3.
2. Select Device Manager tab on the System Properties sheet. 3. Click the plus sign (+) on the right of the ADSPCIUART device category to expand it. As shown on the figure below, you can see Advantech PCI UARTs and Advantech PCI Bridge device names listed under the device category.
3.5.1 Configuring a PCI UARTs Device 1. Double-click the Advantech PCI UARTs device to evoke its Properties page, and then select the Resource tab on the Properties page to look up or configure the current settings of the PCI UARTs device. 2. After you have made the necessary changes or if you are just satisfied with the default settings, click OK to accept. If you want to cancel the configuration, click Cancel.
3.5.2 Configuring a PCI Bridge Device Double-click the Advantech PCI Bridge device to evoke its Properties page, and then select the Resources tab on the Properties page to look up or configure the current configuration of the PCI Bridge device to make sure there are no conflicting devices. Click other tabs to look up or configure the device. Note: The Input/Output Range information is helpful to recognize the communication port attached to the device.
3.6 Remove PCI ICOM Series Device 1. Access Control Panel/System to bring up the System Properties window. 2. Select the Device Manager tab.
3. Click the plus sign (+) on the left of the Ports (COM & LPT) device category to expand it. Select the specific “Advantech PCI communication port” you want to remove, and click the Remove button to remove the device you had selected. 4. The following dialog box will appear to prompt you again to make sure you really want to remove the device from your system.
5. Note: Click the plus sign (+) on the left of the ADSPCIUART device category to expand it, and select the Advantech PCI UARTs or Advantech PCI Bridge you want to remove. You must remove all used ports settings and device settings before you remove the device, or there may be a mistake in the port setting when you install another card.
6. Note: Click the Remove button and the following dialog boxes appear to prompt you whether you really want to remove the device. We recommend you to remove the original device before installing another model of Advantech PCI ICOM series device in the same PCI slot. 3.7 Driver Uninstall 1. Insert the ICOM CD and click the driver you want to uninstall.
2. Choose “Modify” radio button if you want to save another driver. Or choose “Remove” radio button to remove all installed components. 3. Click “Finish“ button to complete the uninstall.
CHAPTER 4 2 ICOM Tools This chapter provides information on installation and usage of ICOM Tools.
Chapter 4 ICOM Tools 4.1 Introduction Advantech ICOM Tools is a convenient utility that has been designed to help you test the performance of ICOM cards through analyzing the port status. It features an easy to use graphical user interface that will soon make you familiar with testing via menu commands and toolbar buttons. Advantech ICOM Tools is applicable to all series of Advantech ICOM cards, and can even be used with other third-party ICOM cards.
4.3 User Interface of ICOM Tools 4.3.1 Menu Bar On the Menu Bar you can select various menu commands to perform port-testing functions. You can also use the short-cut keys.
4.3.2 Tool Bar Using the Tool Bar buttons is a more intuitive way to implement the functions of ICOM Tools.
4.3.3 Com Port Tab Each Com Port tab represents a specific port you have selected for test and configuration. On the tab, you can see the Transfer Mode, Port Status, and Message Logo area. Transfer Modes You can specify the transfer mode to be Normal, loopback (active) or loopback (passive). Normal—allows data to be transmitted and received simultaneously. The data reception rate is helpful in identifying the performance of a communication card installed on your system.
4.3.4 Port Status DTR (data-terminal-ready) DSR (data-set-ready) RTS (request-to-send) CTS (clear-to-send) CD (carrier-detect) For RS-232 specifications, DTR and RTS are for output signals and can be toggled on and off by double-clicking the labels (such as DTR, DSR, RTS, CTS, CD) under the red/green marks. However, if you are using RTS/CTS for flow control to run the test, you will see the RTS mark appear in black.
4.3.6 Tx Slide Bar The Tx Slide Bar allows you to control the overall system loading. You can adjust the transmission rate of your port(s) from 0% to 100%. Just drag the slide button along the track to adjust the transmission rate. 4.3.7 Performance Listing Area On the performance listing area, you can see the relevant information, such as Rx Length (received packet byte length), Bytes/Sec (transmission rate) and Last Abnormal Status of each port running a test. 4.3.
4.4 Using the ICOM Tools Utility To launch the ICOM Tools testing utility, access Start/Programs/Advantech PCI Comm Tools/COM Examine Tools to start the port testing utility. 4.4.1 Port Selection Please follow the steps below to make your port selection: 1. Launch ICOM Tools. You will first see the Program Window such as Figure 4.1. Since you haven’t selected any port for testing yet, all you can see now is a blank window area. Figure 4.
2. Select the port(s) you want to test by the Port/Select menu command or by clicking the Port Select button on the Toolbar, and a dialog box such as Fig. 2 will appear. Figure 4.2: Select Port dialog box Select the port(s) you want to perform test on from the checkboxes next to each COM port. You can either click the checkbox or double-click the name(s) of the port(s) to select/deselect port(s) to perform the test on. The port(s) you selected will immediately appear in the Selected Port field. Figure 4.
Click OK to bring up the ICOM Tools User Interface such as below: Figure 4.4: ICOM Tools User Interface 4.4.2 Configuring a Port You can choose to configure a specific port (or to configure all ports) before running your test.
In the Configure Port dialog box, you can configure the Baud Rate, Data bits, Parity, Stop Bits and the flow control mode for that specific port (or for all ports). After you have configured all the settings you want to change, click OKto make this configuration active. NOTE: When using All Ports Setup button or All Ports/ Setup menu command to configure settings for all ports, you must take care to stop any ports that are running test in order to configure them.
The Performance Listing Area Port The com port number Rx length Received packet length in bytes Bytes/Sec Transmission rate in Bytes/Sec Last Abnormal Status Last abnormal status Stop the Test If you want to stop the test on a specific port, just click Port Stop button or access Port/Stop menu command (or if you want to stop test on all ports, just click All Ports Stop command).
4.5 Messages on Status Bar and Message Logo Area Messages appearing on the Status Bar and Message Logo area are helpful in understanding specific information of your system settings and performance. 4.5.1 Status Bar Messages BUSY: the port is currently used by another application. FAIL: the configuration parameters are not accepted by the port N/A PORT: the port is not available in the system READY: the port is ready to run or to be configured.
4.5.2 Message Logo Messages Port Opened: The user has opened the port Port Setup Fail: The user has set up the port configuration with parameters that are either incorrect or unsupported. Port Running: The port is running a test Port Stopped: The test is stopped on the port Tx Starting/Tx Stopped: transmitting starting/transmitting stop Rx Starting/Rx Stopped : receiving starting/receiving stop Break Error: a break event has been detected on the port Framing Error: A timing error (i.e.
CHAPTER 5 2 Pin Assignments and Wiring This chapter provides information on the pin assignments and wiring.
Chapter 5 Pin Assignments and Wiring 5.1 Pin assignments 5.1.1 PCI-1601A/AU/B/BU, PCI-1602A/AU/B/BU The following table and figure shows the pin assignments for the PCI1601A/B/AU/BU, and PCI-1602A/B/AU/BU cards’ male DB9 connectors on the bracket in RS-422 and RS-485 modes. Table 5.1: PCI-1601/1602 Male DB9 on bracket Pin RS-422 RS-485 1 Tx- Data- 2 Tx+ Data+ 3 Rx+ - 4 Rx- - 5 GND GND 6 RTS- - 7 RTS+ - 8 CTS+ - 9 CTS- - Figure 5.
5.1.2 PCI-1602UP The following table and figure show the pin assignments for the PCI1602UP card’s male DB9 on the cable and female DB25 on the bracket in RS-422 and RS-485 modes. Table 5.2: PCI-1602UP Male DB9 on cable Pin RS-422 RS-485 1 Tx- Data- 2 Tx+ Data+ 3 Rx+ - 4 Rx- - 5 GND GND 6 RTS- - 7 RTS+ - 8 CTS+ - 9 CTS- - Table 5.
5.1.3 PCI-1603 The following table and figure show the pin assignments for the PCI1603 card’s male DB9 on the bracket in RS-232 and current loop modes. Table 5.
5.1.4 PCI-1604UP The following table and figure show the pin assignments for the PCI1604UP card’s male DB9 on the cable and female DB25 on the bracket in RS-232 modes. Table 5.5: PCI-1604 Male DB9 on cable Pin RS-232 1 DCD 2 RxD 3 TxD 4 DTR 5 GND 6 DSR 7 RTS 8 CTS 9 RI Table 5.
5.1.5 PCI-1610A/B/CU The following table and figure show the pin assignments for the PCI1610A/B/CU card’s male DB9 and male DB25 on the cable and female DB37 on the bracket in RS-232 modes. Table 5.7: PCI-1610A/B/CU Male DB9 on cable Pin RS-232 1 DCD 2 RxD 3 TxD 4 DTR 5 GND 6 DSR 7 RTS 8 CTS 9 RI Table 5.
Table 5.
5.1.6 PCI-1610AUP/UP The following tables and figures show the pin assignments for the PCI1610AUP/UP card’s male DB9 on the cable and female DB44 on the bracket in RS-232 mode. Table 5.10: PCI-1610AUP/UP male DB9 on cable Pin RS-232 1 DCD 2 RxD 3 TxD 4 DTR 5 GND 6 DSR 7 RTS 8 CTS 9 RI Table 5.
5.1.7 PCI-1610AJU The following table and figure show the pin assignments for the PCI1610AJU card’s male DB9 on the cable and RJ45 on the bracket in RS232 modes. Table 5.12: PCI-1610AJU male DB9 on cable Pin RS-232 1 DCD 2 RxD 3 TxD 4 DTR 5 GND 6 DSR 7 RTS 8 CTS Table 5.
5.1.8 PCI-1611U The following table and figure show the pin assignments for the PCI1611U card’s male DB9 and male DB25 on the cable and female DB37 on the bracket in RS-422 and RS-485 modes. Table 5.14: PCI-1611U male DB9 on cable Pin RS-422 RS-485 1 TxD- Data- 2 TxD+ Data+ 3 RxD+ - 4 RxD- - 5 GND GND 6 RTS- - 7 RTS+ - 8 CTS+ - 9 CTS- - Table 5.
Table 5.
5.1.9 PCI-1612A/B/AU/U/CU The following table and figure show the pin assignments for the PCI1612A/B/AU/U/CU card’s male DB9 and male DB25 on the cable and female DB37 on the bracket in RS-232, RS-422 and RS-485 modes. Table 5.17: PCI-1612A/B/AU/U/CU male DB9 on cable Pin RS-232 RS-422 RS-485 1 DCD TxD- Data- 2 RxD TxD+ Data+ 3 TxD RxD+ - 4 DTR RxD- - 5 GND GND GND 6 DSR RTS- - 7 RTS RTS+ - 8 CTS CTS+ - 9 RI CTS- - Table 5.
Table 5.
5.1.10 PCI-1620A/B/AU/U The following tables and figures show the pin assignments for the PCI1620A/B/AU/U card’s female DB62 on the bracket in RS-232 modes and male DB9 if you link cable OPT8H, male DB25 if you link cable or connection box with OPT8BP, OPT8C, and female DB25 if you link connection box with OPT8AP.
Table 5.21: PCI-1620A/B/AU/U male DB9 on cable (OPT8H) Pin RS-232 1 DCD 2 RxD 3 TxD 4 DTR 5 GND 6 DSR 7 RTS 8 CTS Table 5.
Table 5.23: PCI-1620A/B/AU/U female DB25 on cable (OPT8AP) Pin RS-232 2 RxD 3 TxD 4 CTS 5 RTS 6 DTR 7 GND 8 DCD 20 DSR Table 5.
5.1.11 PCI-1622CU The following table and figure show the pin assignments for the PCI1622CU card’s female DB78 on the bracket in RS-422 and RS-485 modes and male DB9 if you link cable OPT8J, male DB25 if you link cable with OPT8I. Table 5.25: PCI-1622CU male DB9 on cable (OPT8J) Pin RS-422 RS-485 1 TxD- Data- 2 TxD+ Data+ 3 RxD+ - 4 RxD- - 5 GND GND 6 RTS- - 7 RTS+ - 8 CTS+ - 9 CTS- - Table 5.
Table 5.
Table 5.
5.2 Wiring 5.2.1 RS-232 Signal Wiring Since the RS-232 interface is not strictly defined, many devices have their own connection methods which may ignore some signal lines or define reserved lines for other functions. It is best to refer to the user’s manual for your device for installation instructions. You may find the following helpful. In general, DTE (Data Terminal Equipment) refers to the device that is leading the communication. Examples include PC’s, terminals and some printers.
Table 5.29: Modem Connections DB-25 Male Modem (DCE) Pin Signal Pin Signal 2 TxD 2 RxD 3 RxD 3 TxD 4 RTS 4 CTS 5 CTS 5 RTS 6 DSR 6 DTR 7 GND 7 GND 20 DTR 20 DSR 8 DCD 8 DCD For DTE to DCE connections, use a straight through cable (i.e., you don't have to reverse lines 2 and 3, lines 4 and 5, and lines 6 and 20 since, in general, the DCE RS-232 interfaces are reversed themselves). Table 5.
5.2.2 RS-422 Signal Wiring The RS-422 interface wiring is based on one-to-one principles. The transmit lines on one side connect to the receive lines on the other side, and vice versa. With RS-422, you can transmit and receive data simultaneously (full duplex). The connections are as follows: Table 5.
5.2.3 RS-485 Signal Wiring The RS-485 standard supports half-duplex communication. This means that just two wires are needed to both transmit and receive data. Handshaking signals (such as RTS, Request To Send) are normally used to control the direction of the data flow and to switch the transmission accordingly. In RS-485 mode, the PCI-1601/1602/1611/1612/1622 cards automatically sense the direction of the data flow and switch the transmission direction — no handshaking is necessary.
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