PCL-846 4-Port RS-422/485 Interface Card
Copyright Notice This documentation and the software included with this product are copyrighted 2001 by Advantech Co., Ltd. All rights are reserved. Advantech Co., Ltd. reserves the right to make improvements to the products described in this manual at any time without notice. No part of this manual or software may be reproduced, copied, translated or transmitted, in any form or by any means without the prior written permission of Advantech Co., Ltd.
Contents Chapter 1: Introduction ................................................... 1 Description ............................................................................. 2 Features .................................................................................. 2 Specifications ......................................................................... 3 Card Jumper Layout ............................................................ 4 Chapter 2: Hardware Installation ................................
RS-422 signal wiring ........................................................... 22 RS-485 signal wiring ........................................................... 23 Appendix A: PC I/O Address Reference ......................... 25 PC I/O Address Usage ........................................................ 26 Appendix B: Quick Reference ........................................
CHAPTER Introduction 1
Description PCL-846 series cards provide four independent RS-422/485 serial ports on a card. Each port has a 16C550 UART with an on-chip 16byte FIFO buffer for reliable, high-speed serial I/O. The UART buffers data into 16-byte packets before putting it on the bus. This drastically reduces the CPU load and avoids data loss when the system is busy and cannot process the interrupt quickly. The UART is especially useful for high speed serial I/O under Windows.
• Provides 2000 V DC surgeprotection (PCL-846B) • Space reserved for termination resistors • Supports 2 wire or 4 wire operation • Supports Tx, Rx, RTS, and CTS signals • Automatic RS-485 data flow control or RTS control • RS-422 on Auto/RTS/On mode Specifications • Ports Ports:4 T : 4 x 16C550 with 16-byte FIFO • UA R RT • Speed Speed: 50 ~ 921.
Figure 1-2: PCL-846 switch and jumper layout Card Jumper Layout 4 PCL-846 User's Manual
CHAPTER Hardware Installation 2
Initial Inspection Depending on the option you ordered,in addition to this manual, you should find the following items inside the shipping container: • PCL-846(A/B) 4-port RS-422/485 card • One 30-cm male DB-37 to four male DB-9 cable • One diskette with W indows 95/98/NT drivers (Icom Utility) • PCL-846 manual W e have carefully inspected the PCL-846 mechanically and electri cally before shipping. It should be free of marks and scratches and in perfect working order on receipt.
Card Installation Warning! Turn off your PC’s power supply whenever you install or remove the PCL-846 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. 1. Turn off the computer.Turn the pow eroff to any peripheral devices (such as printers and monitors). 2. Disconnect the pow er cord and any other cablesfrom the back of the computer. Turn the PC if necessary to gain access to the cables. 3.
Card Configuration The ports on the PCL-846 card have jumpers and DIP switches which require configuration before the card is used. DIP switches set the port I/O addresses and speed modes. Jumpers set the port IRQs. 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.
I/O Address and Interrupt Setup Next, you will need to select an I/O base address, and port IRQ (interrupt request) numbers for the PCL-846. Mode Setup (base address setting, S2) The card base address can be set using the DIP switches on the card. The DIP switch labelled "MODE 1" will set the card to standard or enhanced mode, as shown below. Standard Mode In this mode, each of the four ports has a pre-assigned address, as shown below.
Enhanced Mode In the enhanced mode,the card base address is set by the user. Select an address which is not already being used by another card in the system. If you are installing more than one PCL-846 card in your system, set the cards to different base addresses. DIP switches on S1 control each card's base address, as shown below.
Thefollowing example shows how to set the card base address to 2F8. The switch sum is set to 2F8: 200 + 80 + 40 + 20 + 10 + 8 (HEX). Note: On the PCL-846, the address line A9 does not appear on the DIP switch, as it is permanently hardwired to hex 200. Interrupt Level (IRQ) Setting (S2, JP11, JP12, JP13, JP14) The card's IRQ mode can be set using S2. Please note that the DIP switch on S2 labelled MODE 0 is for setting the mode, as shown below.
In this mode, each of the four ports can have IRQ channels set individually. For each port, select an IRQ which is not already in use by another card in the system. The mapping of jumpers to ports is as shown below. Port1 à JP11 Port2 à JP12 Port3 à JP13 Port4 à JP14 Shared IRQ Mode (JP11) Select an IRQ which is not already in use by another card in the system. If you are installing more than one PCL-846, set them to different IRQ numbers. Jumper Bank JP11 controls the card IRQ.
the correspondence between the status register bit which gets set to 0 and the port assigned to generate an interrupt. Interrupt Status Register S2 Bit Function 0 Port 1 1 Port 2 2 Port 3 3 Port 4 4 Not Used 5 Not Used 6 Not Used 7 Not Used A user may change the interrupt status registers' address using the DIP switch S2. Please note that the address decoder will occupy a continuous, 16-byte string of registers starting from the switch setting.
14 A4 A5 A6 A7 A8 Interrupt Register ON ON ON ON ON 200H OFF ON ON ON ON 210H ON OFF ON ON ON 220H OFF OFF ON ON ON 230H ON ON OFF ON ON 240H OFF ON OFF ON ON 250H 260H ON OFF OFF ON ON OFF OFF OFF ON ON 270H ON ON ON OFF ON 280H OFF ON ON OFF ON 290H ON OFF ON OFF ON 2A0H OFF OFF ON OFF ON 2B0H ON ON OFF OFF ON 2C0H OFF ON OFF OFF ON 2D0H ON OFF OFF OFF ON 2E0H OFF OFF OFF OFF ON 2F0H 300H ON ON ON ON
Speed Mode Selection The PCL-846 employs a unique speed option thatallows the user to choose either normal speed mode (1x) or high speed mode (8x). This high speed mode is selected using switch S1. Normal Speed Mode (S1, default) To select a baud rate commonly associated with COM ports, such as 2400, 4800, 9600. . .115.2 Kbps, set the switch labelled "SPEED" to off, as shown: High Speed Mode (S1) To increase the normal baud rates by eight times, (e.g. if 115.
Enable Mode Selection (JP4, JP6, JP8, JP10) Jumpers JP4, JP6, JP8 and JP10 set the driver enable mode selections of ports 1, 2, 3, and 4 respectively. If a jumper is set to "AUTO," the driver automatically senses the direction of the data flow and switches the direction of transmission. No handshaking is necessary. If a jumper is set to "RTS" (request to send), a high RTS signal will enable the driver. Otherwise, the driver output will remain in high impedance status.
CHAPTER Software Installation 3
Operating Environment Selection Set jumper 15 (JP15) to correspond with your desired software operating environment. Connect the left two pins of JP15 to operate in DOS or Windows 3.1 mode, as shown below. Connect the right two pins to operate in Windows 95 or Windows NT mode . JP15 JP15 DOS, Windows 3.
Follo wing completion of installa tion, please r estar ty our system as owing installat re rt your prompted. iver ha ve been installed and the system Once the boar d and dr av board dri restarts successfully, users can execute any ready-made applications, such as HyperTerminal to transmit/receive data, or Remote Access Service to provide dial-up networking capability.
Share IRQ: 3, 4, 5, 6, 7, 9, 10, 11, 12, 15 dr ess: 200H ~ 3F0H Vector Ad Add re Exit After you finish the installation, you can click[E t] and restartyour system. Unless the system is restarted, the latest configuration will not take effect.
CHAPTER Wiring 4 Chapter 4 Wiring 21
Pin assignments The following figures show the pin assignments for the card's DB-9 connectors in RS-422 and RS-485 modes.
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 PCL-846 automatically senses the direction of the data flow and switches the transmission direction — no handshaking is necessary.
Termination resistor setup You can install termination resistors if necessary for impedance matching. The card has mounting spaces for termination resistors, but no resistors are installed at the factory. Depending on your application you may need to solder in a single resistor to handle the DATA+/ DATA- pair (and a corresponding resistor on the other end of the connection). The value of the resistor should equal the characteristic impedance of the signal wires (approximately 120 Ohms).
APPENDIX PC I/O Address Reference A Appendix A PC I/O Address Assignments 25
PC I/O Address Usage Thefollowing table indicates the PC I/O address usage assignment. To prevent conflicting settings of the PCL-846 with other devices or I/O cards, you are recommended to refer this table.
APPENDIX Quick Reference B Appendix B Quick Reference 27
Ø Switch Setting · IRQ Mode DIP 1 (MODE 0) of S2 is used to set the IRQ mode of this card. DIP1 : ON (Upper) position è Shared IRQ mode DIP1 : OFF (Lower) position è Independent IRQ mode · STANDARD/ ENHANCED Mode DIP 2 (MODE 1) of S2 is used to set the Standard/enhanced mode of this card. DIP1 : ON (Upper) position è STANDARD mode DIP1 : OFF (Lower) position è ENHANCED mode Ø Software Operating System Mode Connect the left two pins of JP15 to use DOS, Windows 3.
· STANDARD/ ENHANCED Mode STANDARD MODE: In this mode, the I/O addresses and IRQ levels of each port are set to their default values, as shown below. (Disable BIOS settings of on-board COM1 ~ COM4 ports) Port No. I/O Address COM Port No. Port 1 3F8h Port 2 IRQ Level (*) Independent IRQ Share IRQ COM1 JP11 JP11 2F8h COM2 JP12 JP11 Port 3 3E8h COM3 JP13 JP11 Port 4 2E8h COM4 JP14 JP11 ENHANCED MODE: In this mode, the I/O addresses and IRQ levels of each port are set as shown below.
Ø Enable mode selection: (JP4, JP6, JP8, JP10) ·Auto: automatically senses the direction of data flow ·RTS: high RTS signal enable ·ON: always high or low status for RS-422 mode 30 PCL-846 User's Manual
