Dial Parameters

Parameter

Description

connect_string

This field only applies to Hayes-AT compatible modems. If this field is included, the link will be considered established only after the string specified has been received from the modem. It is not necessary to specify the entire connect string, the first 4 or 5 characters may suffice. Up to 20 non-white characters may be specified, and octal format may be used to specify white characters or "#". For example, CONNECT\0409600 tests for a 9600 bps connection. The \040 is an octal representation of the space character " " occasionally found in this string.

dial_string

This field specifies the phone number to be dialed when calls are made. For CCITT V.25bis dialing, the telephone number must be all digits, and may be up to 80 characters long. Some V.25bis modems allow selection of tone or pulse dialing by preceding the telephone number with a T or P indicating how to dial. For Hayes-AT compatible modems, up to 80 non-white characters may be specified, and octal format may be used to specify white characters or "#". The entire AT command string should appear here.

init_string

This field only applies to Hayes-AT compatible modems. This string is used to initially configure the asynchronous modem, once the board has been loaded. The init string will only be sent once, regardless of how many times the modem is dialed. Up to 80 non-white characters may be specified, and octal format may be used to even specify white characters or "#".

number_of_retries

Default: 0.
The number of times a number will be re-dialed after a failed attempt. Failures include busy numbers, premature hang up, and call time-out (see 'timeout_between_retry'). Errors such as CTS (EIA-RS232C signal) being held low or modem reports no dial tone will terminate a dial attempt immediately without any retries or other numbers being dialed.

timeout_between_retry

Default: 0
The number of seconds after a number has been dialed that will be allowed to pass before the attempt is aborted. If a time-out occurs either the number will be re-dialed or the remaining dial_defns will be attempted.