SENSITRON
A Halma Company
MT4984
MU+ PK-32
Manual (EN)
P. 46/14
Figure 10
RS485 bus devices connection: closed loop (on the left) and open loop (on the right)
+
-
+
-
+
-
+
-
+
-
+
-
Bus1
B
B
A
A
Bus2
++ -- AA B
++ -- AA B
++ -- AA B
++ -- AA B
From the remote auxiliary power supply
Twisted
/ shielded 2x0,2 cable (Belden 9841,
Elan 03929(1)-(5) or equivalent)
+
-
A B
1
2
7
6
5
VI+
VI-
VO-
VO+
NC
1
2
7
6
5
VI+
VI-
VO-
VO+
NC
Serial line 1
board
Serial line 2
board
+
-
+
-
+
-
+
-
+
-
++
--
Bus1
B
A
Bus2
++ -- A BB
++ -- AA B
++ -- A BB
++ -- AA B
B
A
As Bus 1
Twisted
/ shielded 2x0,2 cable (Belden 9841,
Elan 03929(1)-(5) or equivalent)
From the remote auxiliary power supply
+
-
A B
1
2
7
6
5
VI+
VI-
VO-
VO+
NC
1
2
7
6
5
VI+
VI-
VO-
VO+
NC
Serial line 1
board
Serial line 2
board
To next detector or
module
(close the end-line
resitor on the last detector / module)
