Specifications

DTE Interface Pin Assignment A-1
Appendix A
Connector Wiring
A.1 DTE Interface Pin Assignment
The V.24/RS-232 DTE interface of ASM-10/8 terminates in DB-25 female
connector, wired in accordance with Table A-1.
Table A-1. V.24/RS-232 Connector Pinout
V.24 RS-232 DTE
Pin
Signal Identity Description
101 AA 1 Protective
Ground
Chassis ground. May be isolated from Signal Ground (refer to
the CHAS GND jumper description in Table 2-1).
102 AB 7 Signal Ground Common signal and DC power supply ground.
N/A N/A 9
10
+8 volts
–8 volts
Output +8 VDC
Output –8 VDC
103 BA 2 Transmitted Data Serial digital data from a terminal or other source. If
accompanied by an external data rate clock data, transitions
must occur on positive-going transitions of the external
transmit output clock.
104 BB 3 Received Data Serial digital data at the output of the modem receiver. The
data transitions occur at the rising edge of the clock.
105 CA 4 Request to Send A positive level to ASM-10/8 when data transmission is desired.
106 CB 5 Clear to Send
A positive level from ASM-10/8 with selectable delay, after
receipt of Request to Send and when ASM-10/8 is ready to
transmit.
107 CC 6 Data Set Ready
A positive level from ASM-10/8, power is on and ASM-10/8 is
not in the Local Digital Loopback mode or has not received a
Remote Digital Loopback signal from the remote unit.
109 CF 8
Receive Line
Signal Detector
(Carrier Detect)
A positive level from ASM-10/8, except when a loss of the
received input is detected or when Data Set Ready is negative.
113 DA 24 External Trans.
Serial Clock
A serial data rate clock input from the data source. Positive
clock transitions correspond to data transitions.
114 DB 15 Transmitter
Signal
Element Timing
A transmit data rate clock for use by external data source.
Positive clock transitions correspond to data transitions.