PCIe-COM-8SM / -4SM User Manual
17
RS-232
Signals
RS-232 Signal
Descriptions
RS-422
Signals
(4-w 485)
RS-422 Signal
Descriptions
RS-485
Signals
(2-wire)
RS-485 Signal
Descriptions
DCD
Data Carrier Detected
TX+
Transmit Data +
TX/RX +
Transmit / R
RX
Receive Data
TX-
Transmit Data -
TX/RX -
Transmit / Receive -
TX
Transmit Data
RX+
Receive Data +
GND
Signal Ground
DTR
Data Terminal Ready
RX-
Receive Data -
GND
Signal Ground
GND
Signal Ground
DSR
Data Set Ready
RTS
Request To Send
CTS
Clear to Send
RI
Ring Indicator
Table 6-3: COM signal names to corresponding signal descriptions
VHDCI 68-Pin D-Connector
Connections will normally be made to the D-Sub 9-pin connectors through the breakout cable.
In case you wish to connect directly to the 68-pin connector, the pins translate as follows.
DB9 pins
To
VHDCI pins
Ch A
Ch B
Ch C
Ch D
Ch E
Ch F
Ch G
Ch H
1
37
41
45
49
53
57
61
65
2
1
5
9
13
17
21
25
29
3
2
6
10
14
18
22
26
30
4
3
7
11
15
19
23
27
31
5
33
1
33
1
33
1
33
1
67
2
67
2
67
2
67
2
6
38
42
46
50
54
58
62
66
7
35
39
43
47
51
55
59
63
8
36
40
44
48
52
56
60
64
9
4
8
12
16
20
24
28
32
Table 6-4: VHDCI 68-Pin Female D-Connector Pin Assignments
Figure 6-2: VHDCI 68-Pin Female D-Connector Pin Locations
To ensure that there is minimum susceptibility to EMI and minimum radiation, it is important
that the card mounting bracket be properly screwed into place and that there be a positive
chassis ground. Also, proper EMI cabling techniques (cable connect to chassis ground at the
aperture, shielded twisted-pair wiring, etc.) should be used for the input/output wiring.
