Black Box 3600 MODEM manual Pin Signal Description s, Pin 232D Signal Description

Installation

Table 2-1. Pin Signal Description s

	EIA-	CCITT
Pin	232D	V.24	Signal	Description
1		101	Shield	No connection
2	BA	103	Trans-	Serial digital data (to be
			mitted	modulated) from a data terminal or
			Data	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.
3	BB	104	Receive	Serial digital data output to the
			d Data	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.
4	CA	105	Request	A positive level to the modem
			to Send	when data transmission is desired
5	CB	106	Clear to	A positive level from the modem
			Send	in response to Request to Send and
				when the modem is ready to
				transmit. *
6	CC	107	Data Set	A positive level from the modem
			Ready	when power is on and ready to
				operate: In dial-up operation, the
				modem must be off hook to give a
				high DSR signal.*

** 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 Modem 3600