CTC Union ETU-01A User Manual

Appendix A. I/F Specifications
122
November 2001
A.5 RS-232 User Data Channel Connector
When the ETU-01A is ordered with an RS-232 interface,
the physical interface is a 25-pin female D-type connector wired
in accordance with Table A-6.
SIGNAL
FUNCTION
PIN
CIRCUIT
DIRECTION DESCRIPTION
Protective
Ground
1 AA ↔↔
Chassis ground.
May be isolated from signal ground.
Signal
Ground
7 AB ↔↔ Common signal ground.
Transmitte
d
Data
2 BA
To ETU-01A
Serial digital data from DTE.
Received
Data
3 BB
Fm ETU-01A
Serial digital data at the output of
the ETU-01A receiver.
Request to
Sent
4 CA
To ETU-01A
A ON signal to the ETU-01A when
data transmission is desired.
Clear to
Sent
5 CB Fm ETU-01A Constantly ON.
Data Set
Ready
6 CC Fm ETU-01A
Constantly ON,
Except during test loops.
Data
Terminal
Ready
20 CD
To ETU-01A
DTR not used, used for a received
serial data rate clock input from the
DTE.
Data
Carrier
Detect
8 CF
Fm ETU-01A
Constantly ON, except when a loss of
the received carrier signal is
detected.
External
Transmit
clock
24 DA
To ETU-01A
A transmitted data rate clock input
from the data source.
Transmit
Clock
15 DB Fm ETU-01A
A transmitted data rate clock for use
by an external data source.
Receive
Clock
17 DD Fm ETU-01A
A received data rate clock for use by
an external data source.
Remote
Loopback
21 RL To ETU-01A
When on, commands ETU-01A into
remote loop back, can disable by
DIPSW.
Local
Loopback
18 LL To ETU-01A
When on, commands ETU-01A into
local loop back, can disable by
DIPSW.
Test
Indicator
25 TM Fm ETU-01A ON during any test mode
Table A-6 RS-232 user data channel connector pin allocation

CTC Union ETU-01A Specifications

General

Brand	CTC Union
Model	ETU-01A
Category	Control Unit
Language	English