[KNOWLEDGE BASE] [MODEMS]
| WHAT ARE INITIALISATION STRINGS (MODEM INIT STRINGS)? | |
Modem settings are normally controlled through AT commands. AT stands for attention. In Windows 95/98 these are inputted in the EXTRA SETTINGS box in the modem properties. On Macintoshes they are inputted under MODEM INIT. It is critical that the AT commands you enter are a group of commands that the modem likes. If the commands cause an error then it will be necessary to reboot the machine in order to put in different AT commands. AT commands can also be put in manually using a terminal screen. When inputting manually, the modem will normally respond OK after you press enter if it likes the commends you typed. It will respond ERROR if it doesn't like them. You can't normally use the backspace key when manually typing in AT commands. If you make a mistake then you will just have to press enter and then retype the string. AT commands always start with "AT" and then have different terms. A term starts with either a symbol or a letter and usually ends in a number. If a command starts with an S then this is an S-Registry command. It iss usually in the form of S then a number, then the equal sign and then a number. E.G. S10=50. Terms in an AT command are processed from left to right. It's possible for commands to counteract previous commands in the string. AT commands are not case sensitive but they sometimes require all being in the same case. The following are examples of AT commands :
Certain commands work on nearly every modem. These are known as Generic Commands or Hayes Compatible commands. These are commands that the original Hayes Smart Modem worked with, other modems copied these. |
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