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I am setting up a communications link between a Honeywell TDC3000 DCS system and a Bently Nevada vibration monitoring system. The Honeywell system
communicates via MODBUS RTU protocol using RS422/485. The Honeywell configuration of the RS422/485 link uses a two wire connection (TX+ and RX+ are tied together; TX- and Rx- are tied together), in a master-slave, half-duplex configuration. The Honeywell system is already communicating with two other devices (non-Bently), in a daisy chain configuration,
successfully. My problem is that when we connect the Bently system (in a two-wire configuration) to the communication link, all communication stops. When the Bently is disconnected, communication resumes. Anyone experienced this problem before? Any suggestions as to how to solve this problem?
Reggie Waddell
BP Amoco Chemicals
[email protected]
communicates via MODBUS RTU protocol using RS422/485. The Honeywell configuration of the RS422/485 link uses a two wire connection (TX+ and RX+ are tied together; TX- and Rx- are tied together), in a master-slave, half-duplex configuration. The Honeywell system is already communicating with two other devices (non-Bently), in a daisy chain configuration,
successfully. My problem is that when we connect the Bently system (in a two-wire configuration) to the communication link, all communication stops. When the Bently is disconnected, communication resumes. Anyone experienced this problem before? Any suggestions as to how to solve this problem?
Reggie Waddell
BP Amoco Chemicals
[email protected]