KROHNE Summit 8800 Vol 1 - Manual (Page 68)

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SUMMIT 8800 FIELD DEVICE CONNECTION 06
Figure 69 Start/stop signals loop
6 .2 RS 232/RS485 Communications Connections
All I/O boards - Digital, Digital 2, Switch and Analog have an RS232/RS485 connection for serial
communications, with e.g., smart meters or similar devices. These connections are not galvani-
cally isolated from the internal supplies of the SUMMIT 8800; it is, therefore, recommended that
external barrier devices are used in conjunction with these connections.
RS232 connection: Phoenix Contact PSM-ME-RS232/RS232-P
RS485 connections: Phoenix Contact PSM-ME-RS485/RS485-P
Phoenix Contact PSM-ME-RS232/RS485-P
The communication boards have 3 separate galvanically isolated RS232/RS485 connections for
such as serial communication to printers, supervisory systems or gas chromatographs.
If RS485 communication is to be used on any of the boards, string termination must be consid-
ered.
To connect the termination resistor chain both links associated with the RS485 connection
should be set to the ON position.
NOTE: The figure below shows link references for the digital and analog I/O board only. Refer to
Contents for section on link references for the communication board.