Sanyo DSR - 300 - Manual (Page 83)

INTERFACE SPECIFICATIONS 1
82
English
(when optional interface board is installed)
INTERFA
C
E
S
P
E
C
IFICATIONS
Connection
Sanyo digital video recorders support 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.
Cable types
Straight type:
Crossed type:
Termination settings
When connecting multiple devices, you must make
termination settings on both end devices.
z
Set the RS-485 termination switch of the end device to
ON.
z Be sure to set all non-termination devices (i.e., devices
other than the first and last devices) to OFF.
z If you do not make the correct termination settings, data
will be reflected at both ends, affecting other data and
making the data transmitted to each device incorrect.
Example:
Setting the RS-485 termination switch
1
2
3
4
5
6 1
2
3
4
5
6
Not used
Not used
Not used
Not used
1
2
3
4
5
6 1
2
3
4
5
6
Not used
Not used
Not
used
Not
used
System controller
Termination
switch
Multiplexer
Digital video
recorder
ON
OFF
ON
OFF
RS-485
termination
switch
ON OFF
Digital video
recorder
RS-485
termination switch
RS-485
termination switch
ON OFF
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