Selecting an Interface Cable
139
The V.36/RS-449 Interface
The V.36/RS-449 interface pin-out diagram and signal definitions and names are
shown below.
Pin #
Signal
Name
Direction
CCITT #
Case PGND
Protective Ground
Common
101
4
TXD+
Transmit Data
Output
103A
5
TRXC+
Transmit Clock (DCE)
Input
114A
6
RXD+
Receive Data
Input
104A
7
RTS+
Request to Send
Output
105A
8
RTXC+
Receive Clock (DCE)
Input
115A
9
CTS+
Clear to Send
Input
106A
10
TEST
Local Loopback Activation
Output
141A
11
DSR+
Data Set Ready
Input
107A
12
DTR+
Data Terminal Ready
Output
108A
13
DCD+
Data Carrier Detect
Input
109A
14
RLB
Remote Loopback
Output
140A
15
RI
Ring Indicator
Input
125A
17
CLK+
Transmit Clock (DTE)
Output
113A
18
TI
Test Indicator
Input
142A
19
GND
DTE Common Return
Common
102A/B
22
TXD-
Transmit Data
Output
103B
23
TRXC-
Transmit Clock (DCE)
Input
114B
24
RXD-
Receive Data
Input
104B
25
RTS-
Request to Send
Output
105B
26
RTXC-
Receive Clock (DCE)
Input
115B
27
CTS-
Clear to Send
Input
106B
29
DSR-
Data Set Ready
Input
107B
30
DTR-
Data Terminal Ready
Output
108B
31
DCD-
Data Carrier Detect
Input
109B
35
CLK-
Transmit Clock (DTE)
Output
113B
PG N D
RXD+
RTS+
1
RI
DCD+
G N D
TXD+
TRXC+
RTXC+
CTS+
DSR+
DTR+
C L K +
RXD-
RTS-
DCD-
TXD-
TRXC-
RTXC-
CTS-
DSR-
DTR-
TEST
RLB
TI
C LK -
37
19
20
