4-20 Chapter 4: Appendix F - RS-485/422 Option DFlex-4/104 User’s Manual, ver. 0.04
Table 9: SLIM pinouts SLIM
Pin No.
TTL
Signal
RS-232
Signal
RS-485
Signal
RS-423
Signal
Current Loop
Signal
1 N/C
2 RTS 1 RTS A(-) 1 RTS (-) 1 TxD(-) 1
3 TxD 1 TxD A(-) 1 TxD (-) 1 TxD Source 1
4 CTS 1 RTS B(+) 1 RTS Ref 1 RxD(+) 1
5 RxD 1 TxD B(+) 1 TxD Ref 1 TxD(+) 1
6 N/C CTS A(-) 1 CTS A(-) 1 RxD Return 1
7 DTR 1 RxD A(-) 1 RxD A(-) 1 TxD Return 1
8 N/C CTS B(+) 1 CTS B(+) 1 RxD Source 1
9 DCD 1 RxD B(+) 1 RxD B(+) 1 RxD(-) 1
10 RTS 2 RTS A(-) 2 RTS (-) 2 TxD(-) 2
11 TxD 2 TxD A(-) 2 TxD (-) 2 TxD Source 2
12 CTS 2 RTS B(+) 2 RTS Ref 2 RxD(+) 2
13 RxD 2 TxD B(+) 2 TxD Ref 2 TxD(+) 2
14 N/C CTS A(-) 2 CTS A(-) 2 RxD Return 2
15 DTR 2 RxD A(-) 2 RxD A(-) 2 TxD Return 2
16 N/C CTS B(+) 2 CTS B(+) 2 RxD Source 2
17 DCD 2 RxD B(+) 2 RxD B(+) 2 RxD(-) 2
18 Ground
19 +12 V
20 -12 V
21 +5 V
22 DCD 2 Tied high Tied high Tied high
23 CTS 2 Tied high
24 RTS 2
25 DTR 2
26 TxD 2
27 RxD 2
28 RxD 1
29 TxD 1
30 DTR 1
31 RTS 1
32 CTS 1 Tied high
33 DCD 1 Tied high Tied high Tied high
34 TC
35 RC
Note: earlier versions of the current loop SLIM have pins 22, 23, 32, and 33 tied low.