Appendix A. I/F Specifications
123
November 2001
A.6 RS-530 to RS-449 Adapter Cable
When the ETU-01A is ordered with a RS-449 interface,
an RS-530 module and adapter cable provide the proper
interface. The physical interface is a 37-pin male D-type
connector wired in accordance with Table A-7.
SIGNAL
FUNCTION
RS-530
PIN
RS-449
CIRCUIT
DESCRIPTION
Protective
Ground
1 1 Frame
Chassis ground.
May be isolated from signal ground.
Signal
Ground
7
19,20,
37
SG,RC,
SC
Common signal ground.
Transmitted
Data
2
14
4
22
SD(A)
SD(B)
Serial digital data from DTE.
Received
Data
3
16
6
24
RD(A)
RD(B)
Serial digital data at the output of
the ETU-01A receiver.
Request to
Sent
4
19
7
25
RS(A)
RS(B)
A ON signal to the ETU-01A when
data transmission is desired.
Clear to
Sent
5
13
9
27
CS(A)
CS(B)
Constantly ON.
Data Set
Ready
6
22
11
29
DM(A)
DM(B)
Constantly ON,
Except during test loops.
Data Terminal
Ready
20
23
12
30
TR(A)
TR(B)
DTR not used, used for a received
serial data rate clock input from the
DTE.
Data Carrier
Detect
8
10
13
31
RR(A)
RR(B)
Constantly ON, except when a
the received carrier signal is
detected.
External
Transmit clock
24
11
17
35
TT(A)
TT(B)
A transmitted data rate clock input
from the data source.
Transmit
Clock
15
12
5
23
ST(A)
ST(B)
A transmitted data rate clock for use
by an external data source.
Receive
Clock
17
9
8
26
RT(A)
RT(B)
A received data rate clock for use by
an external data source.
Remote
Loopback
21 14 RL
When on, commands ETU-01A into
remote loop back, can disable by DIP
sw.
Local
Loopback
18 10 LL
When on, commands ETU-01A into
local loop back, can disable by DIP
sw.
Test Indicator 25 18 TM ON during any test mode
Table A-7 RS-530 to RS-449 pin allocation
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