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V.35 Signals
Pin #
11
12
14
15
16
17
18
20
21
22
24
All modem control signals are single ended (un-balanced) with RS-232 signal levels.
Please terminate any control signals that are not going to be used. The most common way to do
this is connect RTS to CTS and RI. Also, connect DCD to DTR and DSR. When in External Sync mode,
the external sync signal is fed into DCD. Terminating these pins, if not used, will help insure you get
the best performance from your adapter.
© Sealevel Systems, Inc.
5104e & 5104es Manual | SL9273 8/2021
Signal
2
TDA TX–
3
RDA RX–
4
RTS
5
CTS
6
DSR
7
GND
8
DCD
9
RXCB RXC+
TSETB TSET+
Transmit Signal Element Timing +
TXCB TXC+
TDB TX+
TXCA TXC–
RDB RX+
RXCA RXC–
LL
DTR
RL
RI
TSETA TSET–
Transmit Signal Element Timing –
Name
Transmit Negative
Receive Negative
Request To Send
Clear To Send
Data Set Ready
Ground
Data Carrier Detect *
Receive Clock Positive
Transmit Clock Positive
Transmit Positive
Transmit Clock Negative
Receive Positive
Receive Clock Negative
Local Loopback
Data Terminal Ready
Remote Loopback
Ring Indicator
V.35
Mode
P
Output
R
Input
C
Output *
D
Input *
E
Input *
B
F
Input *
X
Input
W
Output
AA
Input
S
Output
Y
Input
T
Input
V
Input
Output *
H
Output *
Output *
J
Input *
U
Output
11
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