DSP 9612 Flash Poll Modem User’s Guide Complements of ARC Electronics 800-926-0226 arc@arcelect.com www.arcelect.com 0049−0117−000 Rev.
Contents CHAPTER 1 INTRODUCTION .........................................................5 FEATURES ................................................................................................6 APPLICATIONS .........................................................................................7 CHAPTER 2 INSTALLATION ..........................................................9 UNPACKING YOUR HARDWARE ...............................................................9 ADDITIONAL ITEMS YOU NEED ............
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Chapter 1 Introduction C ongratulations for purchasing the finest industrial-grade fastpoll modem available. The DSP9612 (Flash Poll) modem is a 9600/4800/01800 bps modem designed for 4-wire, full-duplex or 2-wire, halfduplex operation over a voice-band leased line. The modem is designed utilizing the latest digital-signal processing (DSP) technology to achieve high performance. The modem employs proprietary modulation and encoding scheme to achieve fast modem training time.
Introduction Features The DSP9612 modem is specifically designed for harsh environments found in utility substations and industrial facilities. Though functionally similar to commercial modems, the DSP9612 provides the following unique features that make it well suited for utility and industrial applications. c Packaged in a rugged, compact enclosure for industrial applications. c Leased-line interface protected with heavy-duty surge protection hardware (15KV).
Applications Applications The DSP9612 modem is designed for point-to-point and multipoint data communications. Figure 1-1 shows a typical multipoint configuration. Figure 1-1. Network of Multipoint Configuration There are a number of factors that can affect the network’s and modem’s operation and performance.
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Chapter 2 Installation T his chapter describes how to install the modem. Unpacking Your Hardware Your package should include: c At least one DSP9612FP modem c A leased-line cable c This User’s Guide If your package contents are damaged or missing, please contact your place of purchase immediately.
Installation Hardware Overview Back View Figure 2-1 shows the back view of the DSP9612FP modem. Starting from the left side, this view shows: c A 4-wire/2-wire configuration block. See page 23. c A female, 25-pin RS-232 connector, for connecting a standard DTE (RTU). See page 26. c A POWER ON/OFF switch. c A power connector. See page 25. Leased Line DTE Connection Power Switch Back View Back V ew Figure 2-1.
Hardware Overview Front View Figure 2-2 shows the front view of the modem. Starting from the left side, this view shows: c A set of nine LEDs. See page 26. c A loopback test switch. See page 27. Figure 2-2.
Installation Installation Summary The modem installation involves the following steps: 1. Finding a suitable location for the modem. See the section below. 2. Configuring the modem. See page 12. 3. Connecting to a transmission line. See page 18. 4. Connecting to a voltage source. See page 25. 5. Connecting a DTE device. See page 26. Finding a Suitable Location The location you select should provide easy access to the back panel communications interface(s) and front panel power interface.
Configuring the Modem High-Speed (Fast Poll) Mode Table 2-1 shows the modem switch settings that can be used when the modem is configured for high-speed (Fast Poll) mode. This mode is enabled when switch SW2-1 is set to OFF. Following this table is an explanation of these settings. Table 2-1.
Installation SW1-1 through SW1-4 − Transmit Level (high- & low-speed modes) Switches SW1-1 through SW1-4 adjust the modem’s transmit level. Table 2-2 shows the transmit levels you can select using these switches. Table 2-2.
Configuring the Modem SW1-5 − Receiver Dynamic Range (high- & low-speed modes) SW1-5 ON = −10 to −43 dBm OFF = +3 to −30 dBm For a low receive signal level, set SW1-5 to ON (−43 dBm ). For short distances or to select a strong receive signal, set SW1-5 to OFF.
Installation SW2-1 − Fast Poll/FSK (high- & low-speed modes) SW2-1 ON = Low-Speed Mode (FSK) OFF = High-Speed Mode (Fast Poll) SW2-1 configures the modem for either low-speed (FSK) mode or high-speed (Fast Poll) mode. As a result, the SW2-1 setting you choose determines the switch definitions for the other switches. c For high-speed mode, the configuration switches follow the definitions in Table 2-1. c For low-speed mode, the configuration switches follow the definitions in Table 2-3.
Configuring the Modem SW2-8 − Carrier Control (high- & low-speed modes) SW2-8 ON = Constant OFF = Switched SW2-8 selects either constant or switched carrier. Constant carrier allows DTEs, such as asynchronous dumb terminals or RTUs, to operate with modems, without the input RTS signal. When constant carrier mode is enabled (SW2-8 set to ON), the modem forces the transmit carrier active and the RTS-CTS delay is minimum (<0.5 ms.).
Installation Low-Speed (FSK) Mode Table 2-3 shows the modem switch settings that can be used when the modem configured for low-speed (FSK) mode. This mode is enabled when switch SW2-1 is set to ON. Following this table is an explanation of these settings. Table 2-3.
Configuring the Modem SW1-1 through SW1-4 − Transmit Level (high- & low-speed modes) Switches SW1-1 through SW1-4 adjust the modem’s transmit level. Table 2-4 shows the transmit levels you can select using these switches. Table 2-4.
Installation SW1-5 − Receiver Dynamic Range (high- & low-speed modes) SW1-5 ON = −10 to −43 dBm OFF = +3 to −30 dBm For a low receive signal level, set SW1-5 to ON (−43 dBm ). For short distances or to select a strong receive signal, set SW1-5 to OFF. SW1-6 and SW1-7 − RTS-CTS Delay (low-speed mode only) Switches SW1-6 and SW1-7 determine the duration of the RTS-CTS delay. Table 2-5 shows the RTS-CTS delays you can select using these switches. Table 2-5.
Configuring the Modem SW2-1 − Fast Poll/FSK (high- & low-speed modes) SW2-1 ON = Low-Speed Mode (FSK) OFF = High-Speed Mode (Fast Poll) SW2-1 configures the modem for either low-speed (FSK) mode or high-speed (Fast Poll) mode. As a result, the SW2-1 setting you choose determines the switch definitions for the other switches. c For high-speed mode, the configuration switches follow the definitions in Table 2-1. c For low-speed mode, the configuration switches follow the definitions in Table 2-3.
Installation SW2-5 − Soft Carrier (low-speed mode only) SW2-5 ON = Disabled OFF = Enabled SW2-5 controls the soft carrier and is valid for low-speed mode only. Setting this switch to OFF configures the modem to transmit a 900 Hz soft carrier to the remote modem after RTS is turned off. Setting this switch to ON prevents the modem from transmitting a soft carrier after RTS is turned off.
Connecting to a Transmission Line In switched-carrier mode (SW2-8 set to OFF), the RTS/CTS delay is 23 ms. SW 2-9 − RX Termination (high- & low-speed modes) SW2-9 ON = Disable Rx Termination OFF = Enable Rx termination SW2-9 selects whether RX termination is enabled for a modem. If you set this switch OFF, the receiver is terminated with 600 Ω. If you set this switch ON, the receiver is not terminated.
Installation Table 2-6. Transmission Line Connector Pin Assignments This Pin Number… Corresponds to This Signal… 1 Rx 2 Rx 3 Tx 4 Tx Figure 2-3.
Connecting to a Voltage Source Connecting to a Voltage Source The back panel of the modem provides the power interface. For convenience, the modems can be powered from the following power sources: c AC Version: 85 to 265 Volts AC, 50 to 60 Hz, single phase c DC Version: 10 to 53 Volts DC Figure 2-1 on page 10 shows the connection to the modem’s power interface. , WARNING Before you connect a voltage source, observe the following power supply voltage guidelines.
Installation Connecting an RS-232 Device The modem back panel provides a female, 25-pin RS-232 connector that accepts an attached RS-232 device (see Figure 2-1 on page 10). This connector accepts a standard connection to a DTE (RTU) that conforms to the pin assignments shown under “RS-232 (RTU) Interface” on page 34. LEDs The front panel of the modem provides the LEDs shown in Table 2-7. Table 2-7.
Loopback Control Switch Loopback Control Switch The front panel of the modem has a push button for initiating the following loopback diagnostic tests: c Local analog loopback started by pressing the button one time. c Local digital loopback started by pressing the button two times. c Remote digital loopback set the local modem’s RTS signal to low. Then press the remote modem’s diagnostics button three times and raise the local modem’s RTS signal to start the test.
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Appendix A Troubleshooting I n the event you encounter a problem using your modem, refer to the troubleshooting information in this appendix. , IMPORTANT If you encounter a problem with your modem, be sure the switches on the bottom of the modem are set to the appropriate positions. If a switch is halfway between an on and off setting, the modem will not operate properly. Problem Solving Table A-1 offers troubleshooting solutions for modem problems. Table A-1.
Troubleshooting Table A-1. Troubleshooting Suggestions If… Perform These Procedures… problem. The RTS, CTS, and TxD LEDs do not blink. The attached terminal or DTE may not be sending data to the modem. Verify that data is being transmitted. If data is being transmitted, make sure the RS232 cable is sound and securely connected to the modem and terminal or DTE.
Appendix B Specifications General Specifications Data rate: 9600, 4800, or 0-1800 bps asynchronous Data format: 8 or 9 data bits with 1 or more stop bits DTE interface: EIA RS-232 or V.24 compatible Line conditions: TELCO Voice band 4- or 2-wire leased line, conditioned or unconditioned Private metallic circuits up to 9.5 miles (24 AWG) without cable equalizer. Up to 15.
Specifications Receiver dynamic range: 0 to –30 dBm or –10 to –43 dBm Operating temperature: -40°C to +85°C Power supply: Wide range switching power supply: • 85 to 265Volts AC, 50/60 Hz, single phase • 10 to 53 Volts DC Surge protection: Leased line, up to 15KV Carrier Control: Constant or switched, DIP switch selectable Carrier loss recovery: Train on Data Throughput delay: Less than 10 milliseconds for fast polling.
Interface Connector Pin Assignments Interface Connector Pin Assignments Leased Line Terminal Block Pin Assignments This Pin Number… Corresponds to This Signal… 1 Rx 2 Rx 3 Tx 4 Tx Back-to-Back Connection to a Second Modem Rx Rx Rx Rx Tx Tx Tx Tx Modem 1 Modem 2 Page 33
Specifications RS-232 (RTU) Interface Signal Name Modem Input/Output DB25 Pin Description Earth GND 1 Earth Ground TXD Input 2 Transmit Data RXD Output 3 Receive Data RTS Input 4 Request To Send CTS Output 5 Clear To Send DSR Output 6 Data Set Ready (Modem Ready) SG - 7 Signal Ground DCD Output 8 Data Carrier Detected DTR Input 20 Data Terminal Ready (Host Ready) Environmental Specifications Operating temperature: -40 to + 85o C Storage temperature: -40 to +125o
Compliances Compliances The modem is designed to meet the following agency requirements: EMI/RFI: FCC part 15 for Class A computing device Industry Canada.
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Appendix C Compliances This device complies with Part 15A of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15A of the FCC Rules.
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Appendix D Limited Product Warranty We warrants that the Product sold will be free from defects in material and workmanship and perform to applicable published specifications for a period of 18 months from the date of delivery to Customer or 12 months from placement into service, whichever occurs first. The liability of hereunder shall be limited to replacing or repairing, at its option, any defective Products which are returned F.O.B., price of such products).
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Appendix E RMA Procedure Return Merchandise Authorization (RMA) Procedure Before returning any product, an RMA number must be obtained. Before asking for an RMA number, ascertain that the product was purchased from If you bought the product from a Distributor or Systems Integrator, the product should be returned to that vendor.
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