Nexus 1250 - Remote Communication Overview

Doc# E107706 5 - 14
5: Communication Wiring
Electro Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Electro Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
You can use an RS485 repeater to network several links of instruments.
NOTES:
• A maximum number of 31 Nexus® meters may be connected to one repeater.
• A maximum number of 31 repeaters may be included on the same network.
5.8: Remote Communication Overview
Either RJ11 (INP2 Option) or RJ45 (INP200 Option) can connect devices at great
distances. Section 5.1 gives an overview of these communication options. Chapter 10
explains the INP2 Internal Modem Option; Chapter 11 explains the INP200 Network
Option.
You can use also use modems to connect devices. EIG recommends using RS485
wiring with a Modem Manager. See Section 5.8.2 for additional information.
5.8.1: Remote Communication—RS232
The link using RS232 is viable for up to 50 feet (15.2 meters).
Set the selector switch under Port 1 to RS232.
Use an RS232 serial extension cable connected to the 9-pin female serial port of the
Nexus® 1250/1252 meter’s Port 1. Program this port for Modbus ASCII. See Chapter
13 in the Communicator EXT
TM
4.0 and MeterManager EXT Software User Manual for
details.
• You must use a Null Modem or Null Cable between the Nexus® meter and the
remote modem when using RS232. A Null Modem enables two DCE devices to
communicate. The figure below details how a null modem reconfigures the RS232
pins.
Figure 5.10: Standard Null Modem Configuration
0INSAT.ULL-ODEM-ALE%ND
0INSAT&EMALE-ODEM-ALE%ND
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