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5.1: Communication Overview
RS232 communication is used to connect a single Nexus® 1262/1272 meter with another device,
such as a computer, RTU or PLC. The link is viable for up to 50 feet (15.2 m) and is available only
through the meter's Optical Port with a communication interface (Optical Port to RS232 Converter)
(Figures 5.2 and 5.3).
RS485 communication allows multiple meters to communicate with another device at a local or
remote site. The Output modules and external displays use RS485 to communicate with the meter.
All RS485 links are viable for up to 4000 feet (1220 m). The Nexus® Socket Meter's Ports 1 and 4
are two-wire, RS485 connections (up to 115,200 baud). Optional Communication Connections for
INP2 (Internal Modem with Dial In/Dial Out), INP200 (10/100BaseT connection) or INP202
(Combination Modem and Ethernet) are cables with appropriate connectors (Fig. 6.2).
Optical
Meter
Port
Meter
RS485
4000 Feet
RS485
Meter
4000 Feet
e
Electro Industries/GaugeTech
Chapter 5
Serial Communication Wiring
Optical Port to RS232
Communication Interface
(A7Z)
RS485/232
Converter
(Unicom 2500)
RS485/232 Converter
(Modem Manager)
Figure 5.1: Communication Overview
Doc # E151701
RS232
50 Feet
RS232
50 Feet
MODEM
RS232
50 Feet
Telephone Line,
Fiber Optic Link or
Radio Link
5-1
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