Installation and Operation
8
COM32 INSTALLATION & OPERATION MANUAL
cable is used to make the RS-485 connections to the “Data +” and “Data -”
terminals of the COM32. Ensure that the polarity is correct.
If the converter is being used to allow the modem to monitor an active RS-485 data
loop, the converter must be set to pass data to the modem only after the carrier
has been detected, otherwise the modem will not answer. For connection with a
modem the switch settings should be as follow:
SW-1: ON (wait for carrier detect)
Figure 2.2.1
COM32 Configuration
Figure 2.2.2
COM32 Connection to a Modem
Switch SW-2 controls whether the RTS signal controls the RS-485 bus, or if the
RS-485 bus is controlled automatically. If the software does not support RTS
control, or the modem being used does not pass this signal, SW-2 must be sent
to the automatic internal timing mode. The two possible settings of SW-2 are as
follows:
Summary of Contents for COM32
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