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2.8.3 Modem Power Control
Channel C (TB5) can optionally be used for modem power control – to power the modem only when
needed to conserve power. Use item 95 to select this feature. In this case channel C is wired either directly
to a Cloud Link modem (R110 or later) in a regular ERX350 enclosure, or to the power distribution board
in a MiWi350 (where power to other modems can be controlled as well). Use the Call-In and Call-Out
Window features to configure modem power control.
2.8.4 Serial RS-232 / RS-485
Connections to the ERX350 serial communication interface at TB4 on the I/O Board are shown in the
image below.
2.8.4.1 RS-232
TXD is at TB4 pin 1
l
RXD is at TB4 pin 2
l
Honeywell
2023
2 ERX350 Installation
2.8 Digital Input / Output Wiring
33
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