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Helmholz Modem 56k 4.1
91
13.3
Serial interface
Layout of the 9-pin D-SUB jack
Description of the signals on the 9-pin D-SUB connector on DCE side:
9-pin D-
Sub DCE
Pin No.
Description
AT com-
mand
Function
CCITT
V-24
EIA
RS23
2
DIN
66020
E/A
DCE to
DTE
1
DCD
AT&C
Data Carrier Detect
109
CF
M5
O
2
RXD
Receive Data
104
BB
D2
O
3
TXD
Transmit Data
103
BA
D1
I
4
DTR
AT&D
Data Terminal
Ready
108
CD
S1
I
5
GND
Ground
102
AB
E2
6
DSR
AT&S
Data set ready
107
CC
M1
O
7
RTS
AT&R
Request to send
105
CA
S2
I
8
CTS
AT&K
Clear to send
106
CB
M2
O
9
RI
Ring Indication
125
CE
M3
O
13.4
Possible Interface Speeds
Baud rate in bps
300 4.800
28.800
600 9.600
38.400
1.200 14.400 57.600
2.400 19.200
115.200
Содержание 700-751-HSM11
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