User manual

AT COMMAND SET

Section 4

4-6

4. On-line Command State

This state is entered after a 'pause'

+++

'pause' escape sequence has been

detected. The modem link is preserved and the user communicates with the local

modem and not the remote DPX-213. All data sent by the remote modem is ignored

but carrier is still monitored and the message "NO CARRIER" will be issued if loss

of carrier is detected. Additionally, some RTS, DTR, or make busy control changes

are acted upon. Any normal command that can be issued in command state can now

be issued in the On-line Command State while a call is active. However, some

commands have no meaning such as ATA, and will return ERROR. The most

common use of the On-line Command State is to issue the ATH command to hang

up the call. Other options to exit the On-line Command State are:

1. ATH Command Received

The modem will execute the following sequence: send an "OK" message to the

DTE, go on-hook (hang-up) and return to Idle State.

2. ATZ Command Received

The modem will execute the following sequence: reset the configuration to the

customer stored value, go on-hook (hang-up), send an "OK" message to the

DTE and return to Idle State.

3. ATO Command Received

The modem will execute the following sequence: send a "CONNECT"

message, unclamp received and transmitted data, and returns to the Data State.

4.4 AT Command Set

The remainder of this Section contains an alphabetical listing of all commands, including

full syntax and details of use. For each command, parameters, default settings (or AT&F)

and the Status Register (S-register) bits that store the present command setting are

provided. If the value in a status register effects the operation of a command, the register

with its default value is shown. For example: S7 (45 seconds).