Bernstein, Eric Newcomer, in Principles of Transaction Processing (Second Edition), 2009 Front-end program Transactional Middleware Products and Standards The E1 part enables the command message echo (E0 disables it). The V1 part informs the modem that the return code message is to be displayed rather than just the value of the return code for example, it displays CONNECT 1200 rather than the code 5 (V0 displays the status code). The Q0 part informs the modem to return a send status code. In this case the string is ‘ ATQ0V1E1S0=0’. This string is sent initially to the modem to set it up. In Figure 15.4 there is an option called Originate. For example, when the modem is to hang-up the connection, the ‘ +++’ is sent followed by a delay then the ‘ ATH’. This is to ensure there is a time delay between the transmission prefix and the suffix string. It can be seen in Figure 15.4 that a prefix and a suffix are sent to the modem.

To modify the delay to 5 seconds, dial the number 9 0112432 and wait 30 seconds for the carrier, then the following command line can be used:

A delay is normally required after the 9 prefix before dialing the actual number. On many private switched telephone exchanges in the UK a ‘9’ must prefix the number if an outside line is required (in Australia it is a ‘ 0’, by contrast).

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