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CVT485: Plug-In RS485 Converter
When in GSM mode, a CVT485 module can be connected onto the control panel’s serial
port as an interface to lengthen the distance between the panel and the PCS250
Communicator Module. The serial cable provided enables a connection of up to 1m
(3ft) from the control panel. If the PCS250 has to be installed further from the control
panel (e.g., better reception), the CVT485 converts serial to RS485 protocol, allowing a
connection of up to 300m (1000ft) from the control panel.
While the connection line A+ and B- of the RS485 connector can be extended up to
300m (1000ft), the power lines (+12V and ground connections of the RS485 connector)
are subject to a shorter length restriction which is based on the wire gauge (this is due
to a voltage drop in the lines during transmission). The maximum wire length for each
of those power lines is as follows: 12m (40ft) for AWG24, 20m (65ft) for AWG22, 30m
(100ft) for AWG 20, and 50m (160ft) for AWG18.
Note: It is possible to connect the RS485 A+ and B- lines to a CV T485 installed on a remote panel and
power the PCS250 using a separate 12V power source with shorter wire lengths.
CVT485-EI01 Printed in Canada 06/2012 PARADOX .COM
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+ - A+ B-
+ 12 VDC
A+ B RS485
CVT485: Plug-In RS485 Converter
Figure 1: CVT485 Connection
GPRS14
PCS250
Up to 300m (1000ft)
*or use an independent power source for the PCS250
CVT485-EI01 Printed in Canada 06/2012 PARADOX .COM
*Up to 50m (160ft) AWG18
Control Panel
CVT485
VDMP3
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