User Manual

14 CompactRF

Operating Manual: Chapter 3 Modes of Operation

When using AT Commands,

use the &W command to

store the most current

settings to memory.

With AT Commands, the settings are not immediately stored to non-volatile

memory, therefore if the modem is powered down at this point, the

Operating Mode would revert to its previous value. To store any recently

updated command registers, the following “write” command must be

entered.

AT&W <ENTER>

3.3 Switching Between Command and Data Modes

The method for switching between data and command modes depends on

which interface you are using (Menu or AT). There is a parameter called

“Interface” (Menu item E) which defines whether the modem is currently

operating in AT mode or Menu mode.

3.3.1 Switching Between AT Command Interface and Data

Mode

Your modem must be in Command Mode for it to execute a command. If

you send characters when the modem is in Data Mode, the modem transmits

the characters over the air.

Depending on its settings, the modem will either power up in Command

Mode or Data Mode. Normally, when first received from the factory, the

unit will power up in Command Mode. In this mode of operation, the

module “autobauds,” meaning that it will adapt to the baud rate of the DTE

equipment to which it is connected. Therefore, when in Command Mode,

you may change the baud rate of your equipment, and the CompactRF will

automatically adjust to this baud rate once an AT string is issued. The new

baud rate is stored in register S102. Several baud rates ranging from 2400

to 19200 may be selected.

You can place the modem into Data Mode either by:

• Issuing the answer command (ATA <ENTER>); or,

• Issuing the online command (ATO <ENTER>).