Motorola MVME2600 manual Bsy

B

Serial Interconnections

Table B-1. EIA-232-D Interconnect Signals (Continued)

Pin	Signal	Signal Name and Description
Number	Mnemonic
22	RI	Ring Indicator. Output from modem to terminal; indicates that an incoming
		call is present. The terminal causes the modem to answer the phone by
		carrying DTR true while RI is active.
23		Not used.
24	TxC	Transmit Clock (DTE). Input to modem from terminal; same function as
		TxC on pin 15.
25	BSY	Busy. Input to modem from terminal; a positive EIA signal applied to this pin
		causes the modem to go off-hook and make the associated phone busy.

Notes

1.A high EIA-232-D signal level is +3 to +15 volts. A low level is −3 to −15 volts. Connecting units in parallel may produce out-of-range

voltages and is contrary to specifications.

2.The EIA-232-D interface is intended to connect a terminal to a modem. When computers are connected without modems, one computer must be configured as a modem and the other as a terminal.

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