Expanders
Expanders are used to increase alarm and relay capacity of the B1290. They
come in their own metal cases with all connectors clearly labeled. Ex-
panders must be located in close proximity to the master B1290 unit for
them to communicate properly. The shielded cables provided to connect
between units are cut to accommodate the maximum allowable distance.
Substituting cables is not recommended.
Make the alarm and relay connections to the expander in the same way as
for the B1290. Use the shielded cable provided to connect between the EXP
connector on the B1290 and SERIAL IN on the expander. On subsequent
expanders, use the cable supplied with the expander to connect between
SERIAL OUT on one board and SERIAL IN on the next.
Next set the DIPswitches on the expander to configure its ID number.
Expander
Position 1
Position 2
Position 3
Number
1
OFF
ON
ON
2
ON
OFF
ON
3
OFF
OFF
ON
4
ON
ON
OFF
5
OFF
ON
OFF
6
ON
OFF
OFF
7
OFF
OFF
OFF
DIPswitch positions 4 through 7 must remain on.
Position 8 is used to control the LEDs. It is normally ON, but if you wish to
conserve power by disabling the LEDs, set this switch to the OFF position.
If the expander address is changed, the unit must have power removed and
then reapplied in order for the master to recognize its new address. All the
expander’s programmed parameters, aside from the voice messages, are
stored in the main ProTalk Plus and are downloaded on power-up.
The expander database will be automatically transferred from the ProTalk
Plus if an expander address is changed or an expander is replaced.
The expander requires its own +12 VDC and GND connections. Be sure
that all units, master and expander(s), are always powered up and down to-
gether. Do not connect or disconnect expander cables when the system is
powered up.
16
Getting Started