S p e c i f i c a t i o n s
A-7
Serial Interface Pin Assignments, DCE Mode
*This refers to the DB-25 Serial interface connector on the back of the unit.
Function
Abbrev.
Direction
Pin #
DB-25*
RS-232
V.35
X.21
RS449/
V.36
Frame Ground
FG
n/a
1
1
A
1
1
Transmit Data
TD
Input
2
2
P
2
4
Receive Data
RD
Output
3
3
R
3
6
Request to Send
RTS
Input
4
4
C
4
7
Clear to Send
CTS
Output
5
5
D
5
9
Data Set Ready
DSR
Output
6
6
E
6
11
Signal Ground
SG
n/a
7
7
B
7
19
Data Carrier Detect
DCD
Output
8
8
F
8
13
Balanced Receiver Clock
(B)RC
Output
9
X
9
26
Balanced Data Carrier Detect
(B)DCD
Output
10
10
31
Balanced External Transmitter Clock
(B)ETC
Input
11
W
11
35
Balanced Transmitter Clock
(B)TC
Output
12
AA
12
23
Balanced Clear to Send
(B)CTS
Output
13
13
27
Balanced Transmit Data
(B)TD
Input
14
S
14
22
Transmitter Clock
TC
Output
15
15
Y
15
5
Balanced Receive Data
(B)RD
Output
16
T
16
24
Receiver Clock
RC
Output
17
17
V
17
8
Local Loopback
Loop 3
Input
18
18
J
18
Balanced Request to Send
(B)RTS
Input
19
19
25
Data Terminal Ready
DTR
Input
20
20
H
20
12
(not used)
n/a
21
21
21
Balanced Data Set Ready
(B)DSR
Output
22
22
29
Balanced Data Terminal Ready
(B)DTR
Input
23
23
30
External Transmitter Clock
ETC
Input
24
24
U
24
17
(not used)
n/a
25
25
25
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