Black Box 3600 General Commands, DTE Controlled Fallback Rate Pin 23 *FB, Local Character Echo E

AT Commands

DTE Controlled Fallback Rate (Pin 23) *FB

Pin 23 of the EIA-232 DTE connector provides signal input to the modem for DTE fallback. If the modem is not using DTE fallback, set this option to ignore pin 23. To cause the modem to act on high/low levels of pin 23, enable this option. Negative level forces a higher rate for primary data rate; positive forces a lower rate providing a fallback rate.

Command	Operation
*FB	Ignore pin 23
*FB1	Transition on pin 23 changes speed

General Commands

This series of commands controls various standard options that in most cases apply to any mode of operation.

Changing from Data Mode to Command Mode +++

To exit data mode and go to online command mode, press the escape character three times (+ is the default). Pause for the length of time set by register S12 (1 second is the default) before and after the +++ to ensure the modem recognizes the escape command.

This sequence temporarily suspends data mode transmissions and allows command mode operations without breaking or otherwise disturbing the telephone line connection. The modem responds with OK when it detects the escape code. Return to data mode by entering the O command.

Note

The AT command set must be enabled.

Local Character Echo E

Type AT without a carriage return. If the screen shows AT character, echo is correct. Proceed with other commands as desired.

If the screen shows AATT, enter the E command to correct the double characters or disable character echo by the modem.

5-22 Modem 3600