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25 Pin Connector Signal Layouts (DB-25 Male)
RS-232 Signals
Base+5, M3-M0=2, 0010
Signal
GND
Ground
RD
Receive Data
CTS
Clear To Send
DSR
Data Set Ready
DCD
Data Carrier Detect
TM
Test Mode
RI
Ring Indicator
TXC
Transmit Clock
RXC
Receive Clock
TSET
Transmit Signal Element Timing
DTR
Data Terminal Ready
TD
Transmit Data
RTS
Request To Send
LL
Local Loop-back
RL
Remote Loop-back
V.35 Signals
Base+5, M3-M0=E, 1110
Signal
GND
Ground
RDB RX+
Receive Positive
RDA RX-
Receive Negative
TXCB TXC+
Transmit Clock Positive
TXCA TXC-
Transmit Clock Negative
RXCB RXC+
Receive Clock Positive
RXCA RXC-
Receive Clock Negative
TDB TX+
Transmit Positive
TDA TX-
Transmit Negative
TSETB TSET+
Transmit Signal Element Timing +
TSETA TSET-
Transmit Signal Element Timing -
CTS
Clear To Send
DSR
Data Set Ready
DCD
Data Carrier Detect
RI
Ring Indicator
DTR
Data Terminal Ready
RTS
Request To Send
LL
Local Loop-back
RL
Remote Loop-back
•
Note: All modem control signals are single ended (un-balanced) with RS-232 signal levels.
Technical Note: 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. Terminating these pins, if not used, will help
insure you get the best performance from your adapter.
Sealevel Systems ROUTE 56.PCI
Name
Pin #
Name
DB-25
Mode
7
3
Input
5
Input
6
Input
8
Input
25
Input
22
Input
15
Input
17
Input
24
Output
20
Output
2
Output
4
Output
18
Output
21
Output
V.35
Mode
7
B
16
T
Input
3
R
Input
12
AA
Input
15
Y
Input
9
X
Input
17
V
Input
14
S
Output
2
P
Output
11
W
Output
24
U
Output
5
D
Input *
6
E
Input *
8
F
Input *
22
J
Input *
20
H
Output *
4
C
Output *
18
Output *
21
Output.*
Technical Description
Page 7
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