Serial Connectors
A-3
Software Version 6.1
and Later
Software version 6.1 and later can assign DTR to pins 3, 6, 9, 12, 15, 18, 21,
and 24, which are not used by earlier software versions. RTS remains on pins
1, 4, 7, 10, 13, 16, 19, and 22. Separating the DTR and RTS inputs allows an
attached device to use RTS flow control and still use DTR to signal the
communications server to disconnect. This hardware configuration is called
dual-input
.
Input pin selection and signal interpretation are controlled by the -TERM
UseDTRin parameter. If this parameter is set to OnRTS, then DTR and RTS
share the same signal. This behavior is identical to earlier software and is the
default. In this case the circuit assignments in Table A-2 still hold.
Table A-2
Serial Connector Pin Assignments, Software Version 6.0
Port
Pin
Signal
Direction
Pin
Signal
Direction
0
1
DTR0/RTS0
In
26
TXD0
In
0
2
SG0
—
27
RXD0
Out
0
3
Not used
—
28
DCD0/CTS0
Out
1
4
DTR1/RTS1
In
29
TXD1
In
1
5
SG1
—
30
RXD1
Out
1
6
Not used
—
31
DCD1/CTS1
Out
2
7
DTR2/RTS2
In
32
TXD2
In
2
8
SG2
—
33
RXD2
Out
2
9
Not used
—
34
DCD2/CTS2
Out
3
10
DTR3/RTS3
In
35
TXD3
In
3
11
SG3
—
36
RXD3
Out
3
12
Not used
—
37
DCD3/CTS3
Out
4
13
DTR4/RTS4
In
38
TXD4
In
4
14
SG4
—
39
RXD4
Out
4
15
Not used
—
40
DCD4/CTS4
Out
5
16
DTR5/RTS5
In
41
TXD5
In
5
17
SG5
—
42
RXD5
Out
5
18
Not used
—
43
DCD5/CTS5
Out
6
19
DTR6/RTS6
In
44
TXD6
In
6
20
SG6
—
45
RXD6
Out
6
21
Not used
—
46
DCD6/CTS6
Out
7
22
DTR7/RTS7
In
47
TXD7
In
7
23
SG7
—
48
RXD7
Out
7
24
Not used
—
49
DCD7/CTS7
Out
None
25
Not used
—
50
Not used
—
CS3000BookFile Page 3 Tuesday, October 15, 1996 5:12 PM
