Modem 34336

DTR DIALING IN V.25 BIS MODE

An alternative to using the V.25bis CRS command to dial a stored number is to use the DTR dialing option. With DTR dialing enabled, the autodialer will dial the number stored in the phone cell displayed in the front-panel AUTO- DIAL screen when DTR goes high for at least 50 ms.

To enable V.25 bis DTR dialing, sue the Summary Setup feature (see Appendix C) to change the parameter for V25 bis DTR dialing to 1. Do not select DTR dialing via the front panel DIALER screen; this will not enable DTR dialing for V.25 bis mode. V.25 bis DTR dialing will function only if the V25bis DTR dialing parameter is enabled (set to 1) and the V.25 bis autodialer is enabled.

6.2 V.25 bis Autodialer Commands

In asynchronous applications, V.25 bis commands are issued directly from the DTE keyboard or through communications software. In synchronous applications, the V.25 bis commands are used to facilitate computer- controlled communications.

Punctuation and spaces may be used with V.25 bis commands for clarity, but they are not required. If used, they are ignored by the modem. One exception is the colon ( : ), which instructs the autodialer to wait for a dial tone.

The V.25 bis commands are described below and are summarized in Table 6-1. See Table 6-3 for explanation of the codes displayed in response to commands.

•CIC — Connect Incoming Call. The CIC command instructs the autodialer to answer incoming calls. The effect is the same as enabling auto-answer on the modem’s front panel.

•CRN — Call Request, Number Provided (Syntax: CRN 5557979). By using the CRN command, you can dial a number directly from the DTE keyboard. Numbers from 0 through 9 can be dialed, and if tone dialing is enabled, the characters A, B, C, D, #, and * can also be dialed.

The dialing parameters listed in Table 6-2 are used with the CRN command to specify how or when a number should be dialed. For example, the command line CRN :T3331234 instructs the autodialer to wait for a dial tone (:) and then tone-dial (T) the number 333-1234.

•CRS — Call Request, Address Provided (Syntax: CRS 2). The CRS command allows you to dial a number simply by specifying its memory address. In the example given above, the autodialer dials the number stored in memory address 2. Store the number at the specified address using the PRN command (Table 6-1).

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MD885C-R2, MD885A-R3, MD885AE-R2, 34336 specifications

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