Init

Commands sent to the modem to initialize it.

One or more command strings can be used. For example,

(1)
HKR, Init,    1,, "AT"
HKR, Init,    2,, "AT &F E0 V1 &D2 &C1 W2 S95=47"
(2)
HKR, Init,    1,, "AT"
HKR, Init,    2,, "AT &F E0 S0=0 $BA0 S25=20"
 

Generally, the Init string should put the modem in the following state:

• Set Factory Defaults. (&F)
• No Echo (E0)
• Return Result Codes (Q0)
• Return all possible Negotiation and Call progress messages (W1 X4 S95=47)
• Track status of carrier detect signal (&C1)
• Monitor DTR. When an off to on transition occurs, hangup and enter command state (&D2)
• Communicate in fixed DTE mode (&Q5)
• Assert DSR always (&S0)
• Do not answer automatically (S0=0)

If settings are set to preceding values after factory default reset (&F), they do not need to be set in the init string. It is important to verify that using &F actually sets the correct options.

The default modulation, compression, and protocol options set in the Init strings should be set to enable maximum flexibility. Do not put any settings in the Init string that prohibit use of modulation, compression, or protocol options.

A large number of modems require that command lines be no greater than 40 characters in length. To be safe, Unimodem assumes that modems can only handle commands less than 40 characters long.

Usually, the modem is set to report verbose responses. However, either verbose or numeric responses are acceptable. It is important that the correct responses are put in the Response registry settings.

The user can define a custom init string in the CPL which will be issued after Unimodem has done its dynamic initialization.

See also

Responses registry key