Rs485 Serial Connection Diagram - gefran 650 L Installation And Instruction Manual

2. INSTALLATION
2.5.

RS485 serial connection diagram

Up to 31 instruments (including different models) can be connected in parallel on the RS485 line. The line must end with a
resistor (120 Ω, 1/2 W).
Host computer
RS485
120
Earth ground (FG)
Host computer
RS485
120
Earth ground (FG)
Shield
+
-
21
22
23
24
Figure 10 - RS485 connection for 650 L indicators
Shield
+
-
45
46
+
47
-
48
Figure 11 - RS485 connection for 1250 L indicators
80224_MHW_650 L - 1250 L_07-2018_ENG - 22
9 4
10 3
+
11 2
-
12 1
650
No. 1
28 4
27 3
26 2
25 1
1250
No. 1
21
22
23
24
120
1/2 W
45 28
46 27
+
47 26
-
48 25
120
1/2 W
1250
No. 31
9 4
10 3
+
11 2
-
12 1
650
No. 31
4
3
2
1