Connection
Connections to terminals and RS-232C/RS-485 Connectors
External alarm sensors
(door bell, interphone, etc.)
1
2
3
to VCR
to VCR
14
(GB)
4
Switching
output
terminal
COM
COM
Alarm input
terminal
1RS-485 (RJ-11) connectors
6-pin (RJ-11) connector layout
Pin No.
A terminal signal
1
Not used
2
Not used
3
A signal
4
B signal
5
Not used
6
Not used
A: Non-inverting driver output/receiver input
B: Inverting driver output/receiver input
Transmission line: 2 conductors
Transmission system: Half duplex
Make the connection to the RS-485 connector using a
modular cable (not supplied).
• If using a straight type cable, connect it between the
A connectors, or between the B connectors (see
illustration below).
• If using a crossed type cable, connect it from the A
connector to the B connector, or from the B
connector to the A connector (see illustration below).
To connector A
Straight-type cable
Straight type
B terminal signal
Not used
Not used
B signal
A signal
Not used
Not used
To connector A
Cross-type cable
Cross type