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Doc # E107706 V1.25 5-18
Telephone Line Remote
Modem
NULL Modem Adapter
(Required if 232/485 Converter does not support
DTE/DCE reconfigura
tion)
RS-
Originate
Modem
RS-232 to RS-485
Converter
(Modem Manager
Recommended)
Nexus 1250/1252
Meter
PC at office
Figure 5.16: Remote Connections—RS-232/RS-485
PSTN (Public
Switched
Telephone
Network)
Nexus 1250/1252
Meter
Remote
Modem
NULL Modem Adapter or Null
Cable Required
RS-232
Local
Modem
PC at office
5.16:
Remote
Communication
Overview
Use modems (dedicated or dial-up) when devices are at great distances. EIG recommends using
RS-485 wiring with a Modem Manager. See section 5.13.
Remote Connection—RS-232
Remote Connection—RS-485