TOA Electronics C-AL80(H), C-AL80(L) instruction manual Master/Slave Connection Example

7.2. Master/Slave Connection Example

For details about unit number settings, etc., refer to p. 19; Master/Slave Connections.

	RS-485 Termination switch (11)
Unit Number Setting switch (3)
C-AL80 Alarm Input Unit	OFF	ON

Master Unit Termination

ON

1 2 3 4 OFF

Unit No.

RS-485 Termination switch (11)

Unit Number Setting switch (3)	OFF	ON
Slave Unit 1
	Termination

ON 1 2 3 4 OFF

Unit No.

RS-485 Termination switch (11)

Unit Number Setting switch (3)	OFF	ON
Slave Unit 2
	Termination

ON 1 2 3 4 OFF

Unit No.

To Slave Unit 3

RS-485 Termination switch (11)

Unit Number Setting switch (3)

From Slave Unit 6 OFF ON

Slave	Unit 7	Termination
ON
1 2 3 4 OFF
Unit No.

Note

Set the RS-485 Termination switch of only the master unit and the last slave unit to ON.

11