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Summary of Contents for Bell 5902
- Page 1 5902 Bell 202 Modem Hardware Manual CONTROL MICROSYSTEMS SCADA products... for the distance 48 Steacie Drive Telephone: 613-591-1943 Kanata, Ontario Facsimile: 613-591-1022 K2K 2A9 Technical Support: 888-226-6876 Canada 888-2CONTROL...
- Page 2 5902 Bell 202 Modem Hardware Manual ©2000 - 2006 Control Microsystems Inc. All rights reserved. Printed in Canada. Trademarks TeleSAFE, TelePACE, SmartWIRE, SCADAPack, TeleSAFE Micro16 and TeleBUS are registered trademarks of Control Microsystems Inc. All other product names are copyright and registered trademarks or trade names of their respective owners.
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Page 3: Table Of Contents
Soft Carrier Turn-off ................20 4.5.6 Clear-to-Send Hold Time ................ 21 4.5.7 Radio Carrier Detect ................21 4.5.8 Duplex ....................22 4.5.9 Test Mode Selection ................22 OPERATION ....................23 Full Duplex ....................23 5902 Bell 202 Modem Hardware Manual October 19, 2007... - Page 4 Carrier Turn Off and the Modbus RTU Protocol ........38 5.8.2 M Option Operation ................38 MAINTENANCE ................... 40 Gain Adjustments ..................40 6.1.1 Transmitter Adjustment ................40 6.1.2 Receiver Adjustment ................40 Modem Test Modes ..................40 5902 Bell 202 Modem Hardware Manual October 19, 2007...
- Page 5 Index of Figures Figure 1: 5902 Module Layout ..................... 9 Figure 2: RS-232 Port Connector (DCE) ................10 Figure 3: RS-232 Wiring - 5902 (DCE) to DTE ..............11 Figure 4: Four Wire Network ....................13 Figure 5: Two Wire Network ....................13 Figure 6: Four Wire RJ-45 Connection ................14 Figure 7: Two Wire RJ-45 Connection ................14...
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Page 6: Overview
Overview The model 5902 Bell 202 modem converts RS-232 signal levels to audio tones for transmission over radios, two wire networks, four wire multi-point networks, and four wire point-to-point networks. The modem is transformer isolated from the communication system, so it is well suited to applications which may experience high voltage transients, static discharges, or high common-mode voltages. -
Page 7: Industry Canada Certification
Industry Canada Certification The model 5902 modem is registered with Industry Canada as complying with standard CS02. The certification number is on a sticker attached to the unit. Industry Canada requires that the following information be conveyed to the user. - Page 8 Cette précaution est particulièrement importante dans les régions rurales. L’utilisateur ne doit pas tenter de faire ces raccordements lui-même; il doit AVERTISSEMENT: avoir recours à un service d’inspection des installations électriques, ou à un électricien, selon le cas. 5902 Bell 202 Modem Hardware Manual October 19, 2007...
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Page 9: Important Safety Information
EXPLOSION HAZARD – WHEN IN HAZARDOUS LOCATIONS, TURN OFF POWER BEFORE REPLACING OR WIRING MODULES. WARNING ! EXPLOSION HAZARD - DO NOT DISCONNECT EQUIPMENT UNLESS POWER HAS BEEN SWITCHED OFF OR THE AREA IS KNOWN TO BE NONHAZARDOUS. 5902 Bell 202 Modem Hardware Manual October 19, 2007... -
Page 10: Installation
5902 is not connected to a SCADAPack controller and the modem reset (/RST) signal and a signal to enable the leds (LEDON) on the 5902 modem are not available. Two jumpers, J1 and J2, are included to enable these signals on the 5902SA modem. Figure 1: 5902 Module Layout shows the location of the jumpers. -
Page 11: Field Wiring
Field Wiring The 5902 modem has three connectors for field wiring. The RS-232 port is wired to the DE-9S socket connector. Refer to section 4.2.1-RS-232 Serial Port for more information. The modem wiring is terminated on either an 8 pole terminal block or an RJ-45 modular jack. The terminal block is used for radios, private lines and leased telephone lines. -
Page 12: Figure 3: Rs-232 Wiring - 5902 (Dce) To Dte
The 5902 modem is connected typically to a DTE device. Figure 3: RS-232 Wiring - 5902 (DCE) to DTE shows a typical connection. The serial cable that is provided with the 5902 modem is suitable for connecting the modem to a Data Communication Equipment (DCE) device. -
Page 13: Terminal Block
Refer to section 4.3- Connecting to Dedicated Lines for wiring diagrams for typical networks. Connecting to Dedicated Lines The 5902 modem operates in full duplex on four wire networks, or in half duplex on two wire networks. It uses leased telephone lines or private lines. -
Page 14: Two Wire Mode
–RX +Tx/Rx –TX SLAVE SLAVE --Tx/Rx –RX +Tx/Rx –TX SLAVE SLAVE --Tx/Rx –RX +Tx/Rx –TX SLAVE SLAVE --Tx/Rx –RX +Tx/Rx –TX Figure 5: Two Wire Network Figure 4: Four Wire Network 5902 Bell 202 Modem Hardware Manual October 19, 2007... -
Page 15: Figure 6: Four Wire Rj-45 Connection
2 Wire Connections 1. no connection 2. no connection 3. no connection 4. +Tx/Rx 5. –Tx/Rx 6. no connection 7. no connection 8. no connection Tx/Rx pair Figure 7: Two Wire RJ-45 Connection 5902 Bell 202 Modem Hardware Manual October 19, 2007... -
Page 16: Figure 8: Four Wire Terminal Block Connection
Tx pair to slaves Rx pair from slaves Figure 8: Four Wire Terminal Block Connection 5902 Termination Block Tx/Rx – – – – Tx/Rx pair Figure 9: Two Wire Terminal Block Connection 5902 Bell 202 Modem Hardware Manual October 19, 2007... -
Page 17: Connecting To A Radio
Wiring diagrams are provided for the following radios. Refer to the manual supplied with your radio for more information. Maxon DM-0500 Series E.F. Johnson models 3410/3490 Motorola RNet series 5902 Bell 202 Modem Hardware Manual October 19, 2007... -
Page 18: Figure 10: Typical Connection To Maxon Radio
12. Audio Output PTT active low Telemetry Radio 13. Carrier Detect Channel 1 enabled 15 pin D-connector 14. PTT Squelch enabled 15. Ground Figure 12: Typical Connection to Motorola Radio 5902 Bell 202 Modem Hardware Manual October 19, 2007... -
Page 19: Configuration Switches
Radio repeaters also require time to engage. The RTS/CTS delay provides this time. When RTS is asserted by the DTE, the 5902 modem closes the KEY output, turns on the transmit carrier, and starts the delay. When the delay has expired, the modem asserts CTS to allow the DTE to transmit. -
Page 20: Carrier Detect Delay
The carrier loss delay always functions in full duplex mode (see section4.5.8-Duplex). The constant carrier option is not available, since the modem can transmit at any time when in full duplex. 5902 Bell 202 Modem Hardware Manual October 19, 2007... -
Page 21: Anti-Streaming
Reception of a soft carrier turn-off tone always ends reception within the soft carrier turn-off delay time (see Specifications). The carrier loss delay is not used when a soft carrier turn-off tone is detected. 5902 Bell 202 Modem Hardware Manual October 19, 2007... -
Page 22: Clear-To-Send Hold Time
If the RCD input signal is true, the modem will not close the KEY output or transmit carrier. This prevents the modem from transmitting over another radio transmission. 5902 Bell 202 Modem Hardware Manual October 19, 2007... -
Page 23: Duplex
The slave modems must be configured for half duplex, constant carrier reception. Otherwise they will be unable to transmit data. See section 4.5.3-Carrier Loss Delay for details on configuring a 5902 modem for constant carrier reception. 4.5.9 Test Mode Selection The TST switch selects the test mode. -
Page 24: Operation
Operation The 5902 Bell 202T modem operates in full duplex on four wire networks, or in half duplex on two or four wire networks, and radios. This section describes how these modes differ in operation. Full Duplex When the modem is configured for full duplex, a carrier is continuously transmitted, and the receiver is continuously enabled. -
Page 25: Figure 13: Transmit Timing With Soft Carrier Turnoff
6. Soft carrier turnoff tone is transmitted for SCT time. 7. Radio is de-keyed and SCT tone is turned off. Modem is ready for next reception or transmission. Figure 13: Transmit Timing with Soft Carrier Turnoff 5902 Bell 202 Modem Hardware Manual October 19, 2007... -
Page 26: Figure 14: Receive Timing Without Soft Carrier Turn-Off
6. CD goes false 4-10 ms after SCT tone starts. Receiver is disabled. No false data is received since receiver is disabled before carrier turnoff. 7. Ready for next reception or transmission upon loss of received carrier. Figure 15: Receive Timing with Soft Carrier Turn-off 5902 Bell 202 Modem Hardware Manual October 19, 2007... -
Page 27: Sample Configurations
Open Adjust these switches to add carrier loss delay as required. open closed Full duplex must be selected. open Close switch to engage Loop Back test. 5902 Bell 202 Modem Hardware Manual October 19, 2007... -
Page 28: Half Duplex Slave For Constant Carrier Master
Close CSH if the RTS signal on the DTE flickers. Also close CSH to transmit an extended MARK after each transmission. open Half duplex must be selected. open Close switch to engage tone transmission test 5902 Bell 202 Modem Hardware Manual October 19, 2007... -
Page 29: Half Duplex Master Or Slave
Use this configuration to connect to a TeleSAFE 6000 or TeleSAFE 6000-16EX RTU with a model 6902 modem, or to a TeleSAFE VS/3 RTU. Both modems are half duplex Bell 202 modems, for use on two or four wire networks or radios. They have a radio key control output. Soft carrier turn-off and radio carrier detect are not implemented. -
Page 30: Normal Speed Connection To Telesafe Rtu
Use this configuration to connect to a TeleSAFE 6000 or TeleSAFE 6000-16EX RTU with a model 6902 modem, or to a TeleSAFE VS/3 RTU. Both modems are half duplex Bell 202 modems, for use on two or four wire networks or radios. They have a radio key control output. Soft carrier turn-off and radio carrier detect are not implemented. -
Page 31: System Configuration Procedures
The best place to work out problems with a new communication system is on a workbench or desk in an office. We recommend you test the basic elements of the system before field installation. 5902 Bell 202 Modem Hardware Manual October 19, 2007... -
Page 32: Full Duplex Point-To-Point Systems
10. Observe the CD LED on receiving modems. The LED should turn on solidly when carrier is received, and turn off solidly when the transmitting modem turns off its KEY LED. 5902 Bell 202 Modem Hardware Manual October 19, 2007... - Page 33 If the maximum message time is close to the anti-streaming time, use the next larger anti- streaming time setting. This allows for variability in the message length. Set the AS0 and AS1 switches accordingly. 5902 Bell 202 Modem Hardware Manual October 19, 2007...
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Page 34: Common Problems And Solutions
The DTE device configuration must be modified to correct this problem. If the DTE device does provide RTS/CTS control, you can purchase the F Option for the model 5902 modem. The F Option provides RTS/CTS control if the DTE is not capable of providing it. -
Page 35: Modem Receives Data But Never Transmits
Check the carrier loss switch settings on the receiving modem. On a 5902 modem the CS0 and CS1 switches must both be closed. If the transmitting modem is not a constant carrier master, it must be configured for half duplex operation. -
Page 36: Missing End Of Long Message
This problem can also be caused by trying to operate a full duplex, constant carrier modem on a two wire network. Full duplex constant carrier always requires four wires. Check that the 2 WIRE switch is open, and the 4 WIRE switch is closed. 5902 Bell 202 Modem Hardware Manual October 19, 2007... -
Page 37: Cd Led Always On In Radio System
RTS. LED Indicators The 5902 modem has seven status LEDs. The LEDs are powered by the communication or SCADA controller module through the I/O bus. The LEDs can be disabled to conserve power. Refer to the controller manual for more information. -
Page 38: F Option
F Option The F option module allows the model 5902 modem to operate with DTE devices that do not implement the proper RTS/CTS hardware handshake. This includes most personal computer SCADA software and many programmable controllers. The F option allows these devices to communicate over two wire systems, multi-point four wire systems and radios. -
Page 39: M Option
Modbus RTU protocol errors when a noise burst occurs at the end of data reception from an RTU. The M option is recommended when using the 5902 modem by a personal computer to communicate with TeleSAFE VS/3 RTUs and TeleSAFE 6000/6000-16EX RTUs that use the model 6902 modem. - Page 40 Option is not recommended for both ends of a full duplex link. (Since carrier is never turned off, the M Option is not needed anyway). The M Option is intended for use in a half duplex switched carrier or constant carrier system. 5902 Bell 202 Modem Hardware Manual October 19, 2007...
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Page 41: Maintenance
The level may be reduced for use with radios or other systems requiring a lower output level. We recommend the 5902 transmitter output level be maintained at its maximum level, to ensure the highest possible signal to noise ratio, wherever possible. Some radios require a lower input level. -
Page 42: Basic Functional Test
DTE be disconnected from the modem to prevent reception of false data. To select this test mode: Apply power to the modem. Open the FDX switch (select half duplex mode). 5902 Bell 202 Modem Hardware Manual October 19, 2007... -
Page 43: Full Duplex Loop Back Test
Second, confirm that the modem transmitter and receiver are functioning. If the modem is used in a full duplex application, perform the test procedure described in section 6.2.3-Full Duplex Loop Back Test. 5902 Bell 202 Modem Hardware Manual October 19, 2007... - Page 44 4 WIRE switch. Connect the transmit (TX) output to the receive (RX) input with external wiring. This tests the line isolation transformers. If these tests indicate the modem is not operating correctly, contact Control Microsystems for further assistance. 5902 Bell 202 Modem Hardware Manual October 19, 2007...
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Page 45: Specifications
5 VDC at 1mA Input 12 VDC at 3mA 24 VDC at 7mA Radio Carrier use or ignore Input Mode optical coupler open collector transistor Radio Transmit Key Output 5 to 15 VDC 25mA 5902 Bell 202 Modem Hardware Manual October 19, 2007... - Page 46 Dimensions 4.25 inch (108 mm) wide 4.625 inch (118 mm) high 1.75 inch (44 mm) deep Model 5902 – 7.5 x 35 DIN rail Mounting Model 5902SA – desktop, rubber feet Packaging Corrosion resistant zinc plated steel with black enamel paint...
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Page 47: Approvals And Certifications
Approvals and Certifications Non-Incendive Electrical Equipment for Use in Class I, Safety Division 2 Groups A, B, C and D Hazardous Locations. 5902 Bell 202 Modem Hardware Manual October 19, 2007...