Sanyo DSR-3709 Instruction Manual page 13

3 INSTALLATION AND CONNECTIONS
Connection
The digital video recorder supports both straight type and
crossed type connection cables.
When using a straight type connection cable, connect the
RS-485 connector's pin A to the pin A socket, or pin B to
the pin B socket.
When using a crossed type connection cable, connect the
RS-485 connector's pin A to the pin B socket, or pin B to
the pin A socket.
A RS485
DO NOT CONNECT TO PHONE LINE
To other
connector A
Straight type cable
Cable types
Straight type:
Not used
1
Not used
2
3
4
Not used
5
Not used
6
Crossed type:
Not used
1
Not used
2
3
4
5
Not used
6
Not used
B
To other
connector A
Crossed type cable
1
2
3
4
5
6
1
2
3
4
5
6
RS-485 termination switch settings
When connecting multiple devices, you must make
termination settings on both end devices.
Set the RS-485 termination switch of both end devices
to ON.
Be sure to set the RS-485 termination switches of all
devices in between (devices other than the first and last
devices) to OFF.
If you don't make the correct termination settings, the
incorrect data will be transmitted to each device.
Example
System controller
Digital video recorder
Time-lapse VCR
12
ON
Termination
switch
OFF
RS-485
OFF ON termination
switch
ON
Termination
switch
OFF
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