User manual

AT COMMAND SET
Section 4
4-10
Copyright (C) Dataplex Pty Ltd
ATF FORCE Line Speed
Parameters : 0 to 6
Default : 0 (Auto Speed)
This command lets you select the transmission speed and modulation format independent
of the DTE interface speed. Use this command in conjunction with the ATB command.
This allows you to go on-line at 300, 1200 or 2400 bps but keep your terminal speed fixed
at some other speed.
ATF0 - Modem autoranges for both originate and answer. The Constant Speed Interface
operates from 300 to 9,600 bps. The DPX-213 will accept incoming calls at
300,1200 or 2400 bps.
ATF1 - Selects 300 bps. CCITT or Bell selected by ATB.
ATF2 - Not used. Responds with ERROR.
ATF3 - Not used. Responds with ERROR.
ATF4 - Selects V.22 or Bell 212A 1200. Speed fixed at 1200 bps.
ATF5 - Selects V.22bis. Speed fixed at 2400 bps.
ATF6 - Similar to ATF0 except that once a connection is established, forces DTE speed to
line.
The DPX-213 will autorange on both answer or originate. Set ATF0 at the answering
modem and it will adjust speed automatically to accommodate the incoming call. If the
Constant Speed Interface (AT&I1) is set, the DTE speed will be the last autobaud speed
(except when ATF6 is used).
ATH HOOK Control
Parameters : 0 or 1
Default : 0 (modem On-hook)
Controls the hook relay, connecting and disconnecting the modem from the telephone line.
ATH with no numeric suffix is interpreted as ATH0 and causes the modem to hang up (go
on-hook) and return to the Idle State.
ATH0 - Forces the modem to go on-hook and return to Idle State.
ATH1 - Forces the modem to go off-hook (on-line).
ATI IDENTIFICATION
Parameters : 0 to 3
Default : 0 (Display "DPX-213")
Returns the modem identification codes to your terminal.
ATI0 - Return modem product code. The DPX-213 sends "DPX-213".
ATI1 - Return ROM checksum.
ATI2 - Return result of checksum verification. The DPX-213 sends "OK" if the checksum
verifies.
ATI3 - Return software revision number.