
STANDALONE DVR USER MANUAL
13
The switch 1 and 2 are terminal resistance switches for RS422 buses. The “ON”
position is factory default meaning the terminal resistances are effective.
Note: When there are several non-terminal devices connected to the 422/485 bus and
this device is not the end of the bus, the resistances should be disconnected.
:
ALARM OUT 4 channel switch-level alarm output,30VDC 1A,125VAC 1A;
5
RS422 interface:for duplex operation of data transmitting and receiving
T
X
+:transmit data, T
X
-:transmit data
R
X
+:receive data, R
X
-:receive data
Note: R + / R- support 485 keyboard
6 Power Input
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