17
SHM-768K
Table 3-1. Interface Signal List (Female Connectors) Pins and
Standard Signal Names.
V.35
EIA-530
X.21
Signal
DB25
34-Pin
DB25
DB25
DB15
Description
Function
Frame Standalone
Standalone
Frame
Standalone
Pin Circuit
Pin Circuit
Pin Circuit/
(Function)
Protective
1
A Frame 101
1
1
1
Chassis ground.
Ground
(Shield)
May be isolated
from Signal
Ground (refer
to Table 3-2).
Signal
7
B Signal 102
7 AB
7
8 —
Common signal
Ground
(Gnd)
and DC power
supply ground.
Transmitted 11
S TD(B) 103
2 BA(A)
2
2 T(A)
Serial digital
Data
9
P TD(A) 103
14 BA(B)
14
9 T(B)
data from DTE.
(Transmit)
The data trans-
itions must
occur on the
rising edge of
the transmit
clock.
Received
12
R RD(A) 104
3 BB(A)
3
4 R(A)
Serial digital
Data
13
T RD(B) 104
16 BB(B)
16
11 R(B)
data at the out-
(Receive)
put of the
modem receiver
The data trans-
itions occur on
the rising edge
of the clock.
Request to 4
C RTS 105
4 CA(A)
4
3 C(A)
A positive level
Send
15
19 CA(B)
19
10 C(B)
to the SHM
when data
transmission is
desired.
