5–12 EPM 9450/9650 ADVANCED POWER QUALITY METERING SYSTEM – INSTRUCTION MANUAL
REMOTE COMMUNICATION OVERVIEW CHAPTER 5: COMMUNICATION WIRING
Either RJ11 (Comm Option 2) or RJ45 (Comm Option 1) can connect devices at great
distances. Section 5.1 gives an overview of these communication options. Chapter 10
explains the Comm 2 Internal Modem Option; Chapter 11 explains the Comm 1 Network
Option.
You can use also use modems to connect devices. 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 EPM
9450/9650 meter’s Port 1. Program this port for Modbus ASCII. See the GE Communicator
Instruction Manual for details.
• You must use a Null Modem or Null Cable between the EPM 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: Figure 5.10: Standard Null Modem Configuration
• The remote modem must be programmed for auto-answer and set at a fixed baud
rate of 9600 with no Flow Control. See Section 5.8.3 and the GE Communicator
Instruction Manual for further details.
5.8.2 Remote Communication-RS485
Use any Port on the EPM 9450/9650 meter. If you use Port 1, set the selector switch
beneath the port to RS485. The link using RS485 is viable for up to 4000 feet (1219 meters).
Use GE Communicator software to set the port's baud rate to 9600 and enable Modbus
ASCII protocol. See the GE Communicator Instruction Manual for instructions. Remember,
Modbus RTU will not function properly with modem communication. You must change the
protocol to Modbus ASCII.
You must use an RS485 to RS232 converter and a Null Modem.
0INSAT.ULL-ODEM-ALE%ND
0INSAT&EMALE-ODEM-ALE%ND
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