Db37 To Db9 - CommTech FASTCOM 422/4-PCI Hardware Reference Manual

12
FASTCOM: 422/4 ADAPTER CABLE
We provide access to the four channels on the FASTCOM: 422/4-PCI adapter through a shielded DB37
connector and an adapter cable (supplied with the board). The adapter cable consists of a DB37 male plug
fanning out to four standard DB9 female receptacles.
FASTCOM: 422/4-PCI
DB37 PIN DESCRIPTION
N.C 1
RTS-4
2
GND 3
RX-4 4
TX-4 5
CTS-3 6
CTS+3 7
RTS+3 8
RX+3 9
TX+3 10
RTS-2 11
GND 12
RX-2 13
TX-2 14
CTS-1 15
CTS+1 16
RTS+1 17
RX+1 18
TX+1 19
DB9 PIN DESCRIPTION
The FASTCOM: 422/4-PCI features four RS-422/RS-485 channels, which are accessed through four DB9
connectors on the cable assembly.
The following is a pin description of the DB9 connectors:
20 CTS-4
21 CTS+4
22 RTS+4
23 RX+4
24 TX+4
25 RTS-3
26 GND
27 RX-3
28 TX-3
29 CTS-2
30 CTS+2
31 RTS+2
32 RX+2
33 TX+2
34 RTS-1
35 GND
36 RX-1
37 TX-1
PIN NO. SIGNAL NAME
1 SIGNAL GROUND (GND)
2 READY TO SEND + (RTS+)
3 READY TO SEND – (RTS-)
4 TRANSMIT DATA + (TX+)
5 TRANSMIT DATA – (TX-)
6 CLEAR TO SEND + (CTS+)
7 CLEAR TO SEND - (CTS-)
8 RECEIVE DATA + (RX+)
9 RECEIVE DATA – (RX-)
DB9 PIN DESCRIPTION
(Four Receptacles)
GND 1
6 CTS+
RTS+ 2
7 CTS-
RTS- 3
RX+
8
TX+ 4
9 RX-
TX- 5
DIRECTION
GROUND
OUTPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
INPUT
INPUT
INPUT