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FW-F103-P-XN-M_v2002_03_EN.docx
4.6.10 TERMINAL C1-C6: COMMUNICATION INTERFACE
The F103-P offers Modbus communication via a serial connection. Make sure that the hardware
layer specific requirements are met to achieve reliable communication. Read the Modbus
communication protocol and Appendix C.
Besides the use of any Modbus compliant master, we offer special configuration software to
completely configure the F103 and read-out logged data, available on our website.
Terminals C5 and C6 are not used and should not be connected.
Type CH: RS485 (2 wire)
With type CH, an RS485 (length of cable max. 1200 meters) communications port is available.
All connected devices on the bus, either in hazardous or safe area, must limit the voltages on
terminals C3 and C4 between -7V and +12VDC with respect to terminal C1 / GND.
The RS485 interface is designed to work without terminations on the bus, due to power limitations.
When the communication interface is configured as an RS485 port (type CH), it is suitable for
use in hazardous area with a permanent connection.
Fig. 35: Terminal connectors – Communication – Type CH: RS485 (2 wire)
Type CX: service port
With type CX, a service port is available to configure the F103-P and read-out logged data via an
external device, e.g. a laptop. The connection is not made with the standard type connectors, but the
connections to terminals C1 through C4 are made via a special service port connector.
To connect a laptop to the service port connector, a special cable is required which is available
through your supplier or our website.
When the communication interface is configured as a service port (type CX), it may
only be used when the area is known to be non-hazardous.
The service port is not intended to be connected with a permanent connection.
Fig. 36: Terminal connectors – Communication – Type CX: service port
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