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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
1
2
3
4
5
6
7
8
10
11
12
13
14
15
16
17
18
19
N.C
RTS-4
GND
RX-4
TX-4
CTS+3
RTS+3
RX+3
TX+3
RTS-2
GND
RX-2
TX-2
CTS-1
CTS+1
RTS+1
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
CTS-4
CTS+4
RTS+4
RX+4
TX+4
RTS-3
GND
RX-3
TX-3
CTS-2
CTS+2
RTS+2
RX+2
TX+2
RTS-1
GND
RX-1
TX-1
RX+1
TX+1
9
CTS-3
DB9 PIN DESCRIPTION
(Four Receptacles)
9
8
7
6
5
4
3
2
1
TX+
TX-
RX+
RX-
RTS-
CTS+
RTS+
GND
CTS-
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:
PIN NO.
SIGNAL NAME
DIRECTION
1
SIGNAL GROUND (GND)
GROUND
2
READY TO SEND + (RTS+)
OUTPUT
3
READY TO SEND – (RTS-)
OUTPUT
4
TRANSMIT DATA + (TX+)
OUTPUT
5
TRANSMIT DATA – (TX-)
OUTPUT
6
CLEAR TO SEND + (CTS+)
INPUT
7
CLEAR TO SEND - (CTS-)
INPUT
8
RECEIVE DATA + (RX+)
INPUT
9
RECEIVE DATA – (RX-)
INPUT
