Sanyo DSR - 300 manual Setting the RS-485 termination switch, Connection, Cable types

1 INTERFACE SPECIFICATIONS

(when optional interface board is installed)

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:

1	Not used	1
	Not used
2		2
3		3
4	Not used	4
5		5
	Not used
6		6

Crossed type:

Not used

1	Not	1
2	used	2
3		3
4		4
5	Not	5
6	used	6
	Not used

Setting the RS-485 termination switch

Termination settings

When connecting multiple devices, you must make termination settings on both end devices.

zSet the RS-485 termination switch of the end device to ON.

zBe sure to set all non-termination devices (i.e., devices other than the first and last devices) to OFF.

zIf 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:

System controller

ON

Termination switch

OFF

Multiplexer

RS-485 ON termination switch

OFF

Digital video		OFF ON
recorder
	RS-485
	termination switch

Digital video	OFF ON
recorder
	RS-485
	termination switch

INTERFACE SPECIFICATIONS

82 English