M90/91 controllers contain built-in serial communication ports. Certain M91 controllers offer serial ports that may be set to either RS232 or RS485.
Jazz controllers comprise Standard Jazz and Jazz2 models:
Standard Jazz models do not contain communication ports, including integral COM ports.
Jazz 2 models comprise a built-in USB programming port.
Ports may be added via Add-on Port modules. Such modules are plugged into the Jazz Jack. An example is MJ20-PRG RS232 Programming Add-On Port, which provides the serial interface for Application program download into the OPLC.
Serial communications capabilities are determined by the type of Add-on Module. For example, the MJ20-PRG Programming Port may be used for RS232 communications with devices that supply active (RS232 positive voltage) DTR and RTS signals.
Ethernet: Jazz 2 controllers
support Ethernet via a Jazz™ Ethernet Communication Port Add-on module
that is plugged into the Jazz Jack. This module adds a single
Ethernet port that can support PC-PLC communications and that also
supports MODBUS/TCP operations.
Ethernet is not supported by
M90, M91, or standard Jazz controllers.
Default COM settings and pin-outs are given in the technical specifications of the relevant Add-on Port.
You can use the RS232 port of your PLC for several purposes:
Direct Communications
This means that your PC is connected to a controller via the proprietary
programming cable.
Modem Communications
A PC can connect to a remote controller via modem.
RS232 communications
Use the serial port to communicate with devices that use the RS232
standard, such as GSM modems for SMS messaging, or MODBUS.
CANbus networking (M90/91
only)
You use your PC to access the RS232 port of that controller is
integrated into an M90 CANbus network. This M90 can act as an RS232-to-CANbus
bridge; via this bridge, you can access any M90 in the network
RS485 communications (M91 according to port settings, M90 via external adapter, and Jazz according to add-on port module type).
Note that a controller cannot use both SMS messaging and modem communications.
In addition, you cannot use Direct Communications and Modem Communications simultaneously. If your PC is connected directly with a controller and you dial a remote controller via modem, all communications are automatically diverted to the remote unit. You will not be able to access the directly connected controller until you 'hang up', terminating the call.
If you encounter problems, refer to the Troubleshooting Communications sections in this Help.