User`s manual

Universal PCI Board Pin Assignments
5-18
CP-138U-I
This board supports RS-422 and RS-485 (both 2 and 4-wire).
Model Board Connector Supported Accessories Serial Connectors
CP-138U-I DB78 (female)
CBL-M78M9x8-100 8×DB9 (male)
CBL-M78M25x8-100 8×DB25 (male)
DB78 (Female): RS-422, RS-485 (4-wire)
Pin Signal Pin Signal Pin Signal
1 GND7 27 RxD5-(A) 53 ---
2 RxD7+(B) 28 --- 54 ---
3 --- 29 RxD4-(A) 55 ---
4 GND6 30 --- 56 ---
5 RxD6+(B) 31 --- 57 ---
6 GND5 32 RxD3-(A) 58 ---
7 RxD5+(B) 33 --- 59 ---
8 --- 34 RxD2-(A) 60 TxD7-(A)
9 GND4 35 --- 61 TxD7+(B)
10 RxD4+(B) 36 --- 62 TxD6-(A)
11 GND3 37 RxD1-(A) 63 TxD6+(B)
12 RxD3+(B) 38 --- 64 ---
13 --- 39 RxD0-(A) 65 TxD5-(A)
14 GND2 40 --- 66 TxD5+(B)
15 RxD2+(B) 41 --- 67 TxD4-(A)
16 GND1 42 --- 68 TxD4+(B)
17
RxD1+(B)
43
---
69
---
18 --- 44 --- 70 TxD3-(A)
19 GND0 45 --- 71 TxD3+(B)
20 RxD0+(B) 46 --- 72 TxD2-(A)
21 --- 47 --- 73 TxD2+(B)
22 RxD7-(A) 48 --- 74 ---
23 --- 49 --- 75 TxD1-(A)
24 RxD6-(A) 50 --- 76 TxD1+(B)
25 --- 51 --- 77 TxD0-(A)
26 --- 52 --- 78 TxD0+(B)