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Appendix A: Interface Pinouts
A.1 Main (Composite) Channel Interface
The MiniStat-Four main (composite) channel interface is configured as a
synchronous RS-232 interface, pinned as DTE, with a female DB25 connector. The
pinout (“pin allocation”) is listed in Table A-1.
Table A-1. Pinout of the main (composite) channel connector.
CCITT V.24 TIA
PIN
SIGNAL
DESCRIPTION
CIRCUIT
RS-232C
NAME
NUMBER
LINE
101
AA
1
Protective
Chassis ground (may be
Ground
isolated from signal
ground or connected to it.
102
AB
7
Signal
Common ground for signal
Ground
leads and DC power supply.
103
BA
2
Transmit
Serial digital transmit
Data
data from the MiniStat-Four.
104
BB
3
Receive
Receive data from modem.
Data
105
CA
4
Request
Continuous positive level
to Send
from the MiniStat-Four.
109
CF
8
Data
Data-carrier detection
Carrier
signal from modem.
Detect
APPENDIX A: Interface Pinouts
