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Appendix D DTE Interface Connectors ASM-20 Installation and Operation Manual
D-2
Table D-1. Interface Signal List (Female Connectors) Pinout and Standard Signal Names
RS-232 V.35 EIA-530 X.21
Signal Function DB-25
Standalone
and Frame
DB-25
Frame
34-pin
Standalone
Pin Circuit
DB-25 Standalone
and Frame
Pin Circuit
DB-25
Frame
DB-15 Standalone
Pin Circuit
[Function]
Description
Protective Ground 1 1 A Frame 101 1 1 1 -
[SHIELD]
Chassis ground. May be isolated from
Signal Ground. See Table 2-1.
Signal Ground 7 7 B Signal 102
Ground
7 AB 7 8 -
[GND]
Common Signal and DC power supply
ground.
Transmitted Data 2 11
9
S TD(B) 103
P TD(A) 103
2 BA(A)
14 BA(B)
2
14
2 T(A)
9 T(B)
[TRANSMIT]
Serial digital data from DTE. The data
transitions must occur on the rising
edge of the transmit clock.
Received Data 3 12
13
R RD(A) 104
T RD(B) 104
3 BB(A)
16 BB(B)
3
16
4 R(A)
11 R(B)
[RECEIVE]
Serial digital data at the output of the
modem receiver. The data transitions
occur on the rising edge of the receive
clock.
Request to Send 4 4 C RTS 105 4 CA(A)
19 CA(B)
4
19
3 C(A)
10 C(B)
[CONTROL]
A positive level to the ASM-20 when
data transmission is desired.
Clear to Send 5 5 D CTS 106 5 CB(A)
13 CB(B)
A positive level from the ASM-20 with
delay, after receipt of Request to Send,
and when the ASM-20 is ready to
transmit.
Data Set Ready 6 6 E DSR 107 6 CC(A)
22 CC(B)
A positive level from the ASM-20 when
the power is on, and the ASM-20 is
(a)not in the DIGITAL LOOP mode, or
(b) has not received a REMOTE
LOOPBACK signal from the remote
unit.
Data Terminal Ready 20 20 H DTR 108 20 CD(A)
23 CD(B)
Not used.