UNIPOWER
UP-2210R/P Hardware installation and configuration manual
7.4 Using multiple meters with Westermo GDW-11 GSM/GPRS-modem and RS-485
The Westermo GDW-11 is an example of an industry GSM/GPRS modem with both RS-485. The
RS-485 is an easy solution if you want to connect one or several meters to one wireless modem/SIM
card. Always choose an industry class modem rather than office equipment when building
communications solutions for your meters in substations. The environment is normally quite
different from an office, both regarding physical environmental factors such as temperature and
EMC.
The figure below shows a meter connected to the modem using RS-485 (there are extra connectors
on the RS-485 cable for multiple meter connection).
Figure 40 - GDW-11 GSM/GPRS modem with RS-485 connection to a
meter
Use the recommended factory setting in the modem for use with RS-485.
See below:
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