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Doc# E151701 5-14
5: Serial Communication Wiring
Electro
Industries/GaugeTech
™
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NOTE:
For 24 or 48 V DC applications, EIG recommends the PB1 power supply.
Example order number
: PB1-D-12VO (PB1)
If you are using a PSIO (for 125V AC/DC input) or PB1 your maximum VA is 12.
5.3.9: Remote Communication Over Telephone LineCommunica-
torPQA®s Using the RS485 Port
Use modems (dedicated or dial-up) when devices are at great distances. EIG
recommends using RS485 wiring with a Modem Manager.
Figure 5.11: Remote RS485 Connections
Use Port 1 or Port 4 for RS485 communication. The link using RS485 is viable for up to
4000 feet (1219 meters).
Use CommunicatorPQA® software to set the port’s baud rate to the appropriate speed
for your hardware and/or network and enable Modbus ASCII protocol. See the
CommunicatorPQA®, MeterManagerPQA
®
, and EnergyPQA.com
®
Software User
Manual
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. EIG recommends
using its Modem Manager. This converter has a built-in null modem and also provides
line data buffering, making the telephone line communication reliable; most commer-
RS232 to RS485
Converter
(Modem Manager
Recommended)
Nexus® 1262/1272 Meter
Tele
p
hone Line
PC at office
Remote Modem
Originate Modem
Null Modem Ada
p
ter
(Not required if Modem Manager is used)
Содержание Nexus 1262
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