Black Box 3600 User Manual page 32

Installation
Table 2-1. Pin Signal Description s
EIA- CCITT
Pin 232D V.24
1
2 BA
3 BB
4 CA
5 CB
6 CC
* Modem options may force these signals on or cause them to be ignored.
*
** Refer to Appendix C, Hardware Options.
*
† This function can be disabled or its logic sense reversed by hardware straps.
*
2-4
Signal
101 Shield
103 Trans-
mitted
Data
104 Receive
d Data
105 Request
to Send
106 Clear to
Send
107 Data Set
Ready
Modem 3600
Description
No connection
Serial digital data (to be
modulated) from a data terminal or
other digital data source:
Synchronous data must be
accompanied by the modem
transmit clock (pin 15) or by an
external data rate clock (pin 24).
Data transitions should occur on
positive-going clock transitions;
asynchronous data does not
require a transmit clock.
Serial digital data output to the
DTE interface: Sync data is
accompanied by an internal data
rate (receive) clock (pin 17) that
has positive-going transitions on
the data transition. Async data
does not require a receive clock.
A positive level to the modem
when data transmission is desired
A positive level from the modem
in response to Request to Send and
when the modem is ready to
transmit. *
A positive level from the modem
when power is on and ready to
operate: In dial-up operation, the
modem must be off hook to give a
high DSR signal.*