Connections Page 13
Note: When using the VDMP3, certain programming options must
be configured. Refer to the VDMP3 installation manual for more
information. As well, only one VDMP3 Voice Module can be installed,
either on the control panel or the PCS250 GPRS/GSM Communicator
Module.
If the VDMP3 module is installed and the GSM network reception
is weak, the volume setting can be adjusted to help improve the
VDMP3’s response to keys pressed on a telephone. The default
volume is 90; this allows for best communication. Valid range
values are between 50 to 100, anything outside of this range will
reset the volume to 90. To adjust the GSM volume the following
SMS command must be sent:
P[admin].VOLOUT.[volume value]
e.g., Padmin.VOLOUT.95
Where [admin] is the PCS250 default password (if the password
has been changed, enter in the new password) and [volume
value] is the new volume level. The PCS250 will receive the SMS
message and then adjust the volume setting accordingly.
Using an RS485 Link (GSM mode only)
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. The serial cable
provided enables a connection of up to 1m (3 ft.) 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 (1000 ft.) from the
control panel.
While the connection line A+ and B- of the RS485 connector can
be extended up to 300m (1000 ft.), 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). Please
refer to Using an External Power Input on page 14 for more details
on maximum wire length.
Note: It is possible to connect the RS485 A+ and B- lines to a CVT485
installed on a remote panel and power the PCS250 using a separate
12V power source with shorter wire lengths.
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