AMAX-1220/1240 Series User Manual
20
2.3.2
Terminal Resistor
2.4
Board ID Setting (SW1)
SW1 is used to assign the ID occupation in network. AMAX-1240 will ONLY occupy 1
ID by node number setting, but AMAX-1220 will occupy 4 consecutive ID by node
number setting.
Take AMAX-1240 as example. If Pin 1 to Pin 4 are OFF, but Pin 5 & 6 are ON, the
node number is 3. Then, AMAX-1240 board ID is 3 and only occupies this address.
Take AMAX-1220 as example. If Pin 1 to 3 are OFF, but Pin 4 is ON, the node num-
ber is 4 (Please see Note 2). Then, AMAX-1220 board ID will occupy 4,5,6,7 as con-
secutive sequence. Other AMAX device shall avoid to occupy these 4 board ID.
Assume your system uses one AMAX-1220 and one AMAX-1240. And, your node
number is assigned as the above case. Then, the ID occupation would be 3,4,5,6,7,
and the other ID would be empty for other AMAX devices.
Table 2.4: Terminal Resistor
PIN
100
1/4W Resistor
3
6
Note!
Terminal Resistor is used for the last module only.
Table 2.5: Board ID Setting (SW1)
Pin
Label
ON
OFF
1
DN5
1
0
2
DN4
1
0
3
DN3
1
0
4
DN2
1
0
5
DN1
1
0
6
DN0
1
0
Note 1!
Node Number=8xDN3+4xDN2+2xDN1+DN0.
Default Setting: All the switches are in OFF status. AMAX-1240 needs 6
digits to set up the board ID.
Note 2!
AMAX-1220 ONLY needs first 4 pins to set up the board ID. Shortly, pin
5 and pin 6 ARE NOT available to use. Only use pin 1 to 4 to set up.
