CHAPTER 5: COMMUNICATION WIRING REMOTE COMMUNICATION OVERVIEW
EPM 9450/9650 ADVANCED POWER QUALITY METERING SYSTEM – INSTRUCTION MANUAL 5–13
5.8.3 Programming Modems for Remote Communication
You must program a modem before it can communicate properly with most RS485 or
RS232-based devices. This task is often quite complicated because modems can be
unpredictable when communicating with remote devices.
You must set the following strings to communicate with the remote EPM meter(s). Consult
your modem’s manual for the proper string settings or see Section 5.8.3.1 for a list of select
modem strings.
Modem Connected to a Computer (the Originate Modem)
• Restore modem to factory settings. This erases all previously programmed
settings.
• Set modem to display Result Codes. The computer will use the result codes.
• Set modem to Verbal Result Codes. The computer will use the verbal result codes.
• Set modem to use DTR Signal. This is necessary for the computer to ensure
connection with the originate modem.
• Set modem to enable Flow Control. This is necessary to communicate with remote
modem connected to the EPM meter.
• Instruct modem to write the new settings to activate profile. This places these
settings into nonvolatile memory; the setting will take effect after the modem
powers up.
Modem Connected to the EPM Meter (the Remote Modem)
• Restore modem to factory settings. This erases all previously programmed
settings.
• Set modem to auto answer on n rings. This sets the remote modem to answer the
call after n rings.
• Set modem to ignore DTR Signal. This is necessary for the EPM meter, to insure
connection with originate modem.
• Set modem to disable Flow Control. The EPM meter’s RS232 communication does
not support this feature.
• Instruct modem to write the new settings to activate profile. This places these
settings into nonvolatile memory; the setting will take effect after the modem
powers up.
• When programming the remote modem with a terminal program, make sure the
baud rate of the terminal program matches the EPM meter’s baud rate.
Selected Modem Strings
Modem String/Setting
Cardinal modem AT&FE0F8&K0N0S37=9
Zoom/Faxmodem VFX V.32BIS(14.4K) AT&F0&K0S0=1&W0&Y0
Zoom/Faxmodem 56Kx Dual Mode AT&F0&K0&C0S0=1&W0&Y0
USRobotics Sportster 33.6
Faxmodem:
DIP switch setting
AT&F0&N6&W0Y0 (for 9600 baud)
Up Up Down Down Up Up Up Down
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