62 Chapter 7 Communications
Chapter 7 Communications
7. Chapter 7 Communications
A full description of the communications protocols is found in the
PM172EH ASCII, Modbus and DNP 3.0 Communications Manuals
provided on electronic media
COM1
COM2
Figure 7-1 RS-232/RS-422/RS-485 and RS-422/RS-485 Terminal
Blocks
RS-232 - up to 15 meters distance, 1 PC/PLC to 1 PM172EH, by flat or twisted pair
cable of 0.33mm
2
/22AWG. RS-422, RS-485 - up to 1200 meters distance, up to 32
instruments on one multi-drop line.
Computer Connections COM1 - RS-232
Figure 7-2 RS-232 Simple 3-Wire
Connection, 25-pin
Figure 7-3 RS-232 Simple
3-Wire Connection, 9-pin
Figure 7-4 RS-232 Hardware
Handshaking Connection, 25-pin
Figure 7-5 RS-232 Hardware
Handshaking Connection, 9-pin
+TX Transmit Data Plus
+RX Receive Data Plus
-TX Transmit Data Minus
-RX Receive Data Minus
Chassis Ground
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