Appendix A. I/F Modules
76
May 2011
A.4 RS-530 User Data Channel Connector
When the ETU-01A is ordered with an RS-530 interface, the physical interface is a 25-pin female
D-Sub type connector wired in accordance with Table A-5.
SIGNAL
FUNCTION
PIN CIRCUIT DIRECTION DESCRIPTION
Protective
Ground
1 Frame
↔
Chassis ground.
May be isolated from signal ground.
Signal
Ground
7 AB
↔
Common signal ground.
Transmitted
Data
2
14
BA(A)
BA(B)
To ETU-01A Serial digital data from DTE.
Received
Data
3
16
BB(A)
BB(B)
From ETU-
01A
Serial digital data at the output of the ETU-01A
receiver.
Request to
Sent
4
19
CA(A)
CA(B)
To ETU-01A A ON signal to the ETU-01A when data
transmission is desired.
Clear to
Sent
5
13
CB(A)
CB(B)
From ETU-
01A
Constantly ON.
Data Set
Ready
6
22
CC(A)
CC(B)
From ETU-
01A
Constantly ON,
Except during test loops.
Data
Terminal
Ready
20
23
CD(A)
CD(B)
To ETU-01A DTR not used, used for a received serial data
rate clock input from the DTE.
Data Carrier
Detect
8
10
CF(A)
CF(B)
From ETU-
01A
Constantly ON, except when a loss of the
received carrier signal is detected.
External
Transmit
clock
24
11
DA(A)
DA(B)
To ETU-01A A transmitted data rate clock input from the
data source.
Transmit
Clock
15
12
DB(A)
DB(B)
From ETU-
01A
A transmitted data rate clock for use by an
external data source.
Receive
Clock
17
9
DD(A)
DD(B)
From 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
loopback, can disable by dipsw.
Local
Loopback
18 LL To ETU-01A When on, commands ETU-01A into local
loopback, can disable by dipsw.
Test Indicator 25 TM From ETU-
01A
ON during any test mode
Table A-5 RS-530 user data channel connector pin allocation
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