11
© Sealevel Systems, Inc. 5104e & 5104es Manual | SL9273 8/2021
V.35 Signals
Pin #
Signal
Name
V.35
Mode
2
TDA TX
–
Transmit Negative
P
Output
3
RDA RX
–
Receive Negative
R
Input
4
RTS
Request To Send
C
Output *
5
CTS
Clear To Send
D
Input *
6
DSR
Data Set Ready
E
Input *
7
GND
Ground
B
8
DCD
Data Carrier Detect *
F
Input *
9
RXCB RXC+
Receive Clock Positive
X
Input
11
TSETB TSET+
Transmit Signal Element
W
Output
12
TXCB TXC+
Transmit Clock Positive
AA
Input
14
TDB TX+
Transmit Positive
S
Output
15
TXCA TXC
–
Transmit Clock Negative
Y
Input
16
RDB RX+
Receive Positive
T
Input
17
RXCA RXC
–
Receive Clock Negative
V
Input
18
LL
Local Loopback
Output *
20
DTR
Data Terminal Ready
H
Output *
21
RL
Remote Loopback
Output *
22
RI
Ring Indicator
J
Input *
24
TSETA TSET
–
Transmit Signal Element Timing
–
U
Output
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.
