Dataplex DPX-213, User Manual

Page: 37 / 93

Section 4
AT COMMAND SET
Copyright (C) Dataplex Pty Ltd
4-15
ATZ Modem Reset
Parameters : 0,1
Default
: None
Entering ATZ0 resets the modem and copies the user stored NVRAM configuration to the
active RAM. It restores all user controlled settings to previously stored values. If the
NVRAM contains an invalid configuration, typing ATZ will merely copy the bad data
from NVRAM to active RAM. You must use AT&F (load factory configuration from
ROM to RAM) followed by AT&W (write RAM configuration to NVRAM) to recover
from this.
If the modem is in the On-line Command State this command will terminate the call and
the modem will return to the Idle State after the command is processed. See also the AT&F
command which copies the factory defaults from ROM into the active RAM.
If ATZ1 is entered, the unit will be placed in the very low power standby mode (depending
upon DTR level and setting of jumper J5). The modem may be woken from this state by
either raising the DTR, activity on DTE Txd, Ring detection or power cycle. When the
modem is in standby mode the unit is effectively switched off. If a unit is on line the
connection will be lost.
AT&C CARRIER Detect Control
Parameters : 0 or 1
Default
: 0 (CD Pin 8 always High)
This command controls the status of both the CD lead (Pin 8) in the V.24/RS-232 interface
and the front panel CD LED.
AT&C0 - V.24 Pin 8 CD and LED always forced on.
AT&C1 - V.24 Pin 8 CD and LED follows phone line data carrier.
AT&D DTR Control
Parameters : 0 to 3
Default
: 0 (DTR Always On)
This command controls events on the fall of DTR (Data Terminal Ready). See the AT&M
command for interactions on the rise of DTR. When this command is enabled, the DTR
lead must be high for the modem to operate correctly.
AT&D0 - DTR input ignored.
AT&D1 - Modem set to Command State when DTR drops (as for escape sequence).
AT&D2 - Modem set to on-hook and returns to Command State when DTR drops
(ATH).
AT&D3 - Modem initializes (executes ATZ) when DTR falls.