TRICONEX 3003 Power card

REQUEST TO SEND. Input to the modem from the terminal when required to transmit a message. With RTS off, the modem carrier remains off. When RTS is turned on, the modem immediately turns on the carrier CLEAR TO SEND. Output from the modem to the terminal to indicate that message transmission can begin. When a modem is used, CTS follows the off-to-on transition of RTS after a time delay

RING INDICATOR. Output from the modem to the terminal; indicates to the terminal that an incoming call is present. The terminal causes the modem to answer the phone by carrying DTR true while RI is active.

Levels of Implementation 

There are several levels of conformance that may be appropriate for typical EIA-232-D interconnections. The bare minimum requirement is the two data lines and a ground. The full implementation of EIA-232-D requires 12 lines; it accommodates: 

❏ Automatic dialing 

❏ Automatic answering 

❏ Synchronous transmission

Signal Adaptations 

One set of handshaking signals frequently implemented are RTS and CTS. CTS is used in many systems to inhibit transmission until the signal is high. In the modem application, RTS is turned around and returned as CTS after 150 microseconds. RTS is programmable in some systems to work with the older type 202 modem (half duplex). CTS is used in some systems to provide flow control to avoid buffer overflow. This is not possible if modems are used. It is usually necessary to make CTS high by connecting it to RTS or to some source of +12 volts such as the resistors shown in Figure E-1. CTS is also frequently jumpered to an MC1488 gate which has its inputs grounded (the gate is provided for this purpose).

product application

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