SHM 128 - 511004311 - Update: 11/25/2004 10/31
III - INTERFACES
1. V28 interface
ITU-T :
V24 + V28 (RS232)
ISO
:
2110
Circuit
Pin
Meaning
Name
Signal
source
ITU-T
EIA
102
AB
7
Signal ground
GND
103
BA
2
Transmit data
TD
→
104
BB
3
Receive data
RD
←
105
CA
4
Request to send
RTS
→
106
CB
5
Clear to send
CTS
←
107
CC
6
Data set ready
DSR
←
108
CD
20 Data terminal ready
DTR
→
109
CF
8
Data carrier detect
DCD
←
113
DA
24 External transmit clock
ExtClk
→
114
DB
15 Modem transmit clock
TC
←
115
DD
17 Modem receive clock
RC
←
140
RL
21 Remote loop back
RLB2
→
141
LL
18 Local loop back
LLB3
→
142
TM
25 Test indicator
TI
←
→
Terminal signal source
←
Modem signal source