Serial RS-232 or RS-485 communication is supported by the RMC75S CPU module, allowing the RMC75S to interface to other devices such as HMIs and PLCs. The RMC performs as a slave, requiring a master to control it. It always waits for a request from a master serial device before responding. It does not initiate communications.
The RMC150 does not support serial RS-232 or RS-485. However, the RMC150E can communicate to serial RS-232/485 devices via serial-to-Ethernet converters, available from manufacturers such as Lantronix (UDS100-IAP) or Allen-Bradley (1761-NET-ENI). Contact Delta for more information.
The RMC75S has two communication ports, which can be used simultaneously:
Monitor Port (Port 0)
The RMC75S Monitor Port (port 0) is intended to be used for communication with RMCTools, but may also be used with other devices. This port supports only RS-232 at fixed settings. For details, see the Monitor Port topic.
Notice that the RMC75P also has a serial RS-232 serial Monitor port.
Port 1
Port 1 on the RMC75S module is intended to be used for communication with devices such as PLCs and HMIs. Port 1 supports either RS-232 and RS-485 (2-wire only). See the Configuring Serial Communications topic for instructions on how to configure port 1.
For basics on using serial communications, such as reading and writing registers and issuing commands, see the Using Serial Communications topic.
Features
The RMC75S serial port 1 has a great amount of flexibility, as summarized below:
Protocols:
Baud Rate: 9,600 to 115,200
Parity: Odd, Even, or None
Line Drivers: RS-232 and RS-485
Termination and Biasing (RS-485 only): Both jumper-selectable on the connector
Setup
Because of the large number of options offered by the RMC75, setting it up can be intimidating to users new to serial communications. Read each of the following topics carefully before designing your serial network:
Configuring the RMC7xS Serial Communications
RS-485 Termination and Biasing
Protocols
The following topics describe how to use each protocol supported by the RMC75S:
Mitsubishi Bidirectional Protocol
Using Serial Communications
See the Using Serial Communications topic.
See Also
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