Z1
RS-232
This command resets the T-311 RS-232C port to default values (the contents of registers S*4 and
S13, and bit 1 of S14, are reset to default values, that is: 1200 baud, 8-bit data word, parity off, echo
off).
&D
Response to DTR
This command determines the T-311 response to a Data Terminal Ready (DTR) signal received from
the computer.
&D or &D0 Ignore DTR, LED on
This commands the T-311 to ignore DTR (RS-232-C pin 4) and turns the DTR LED permanently on.
(Default)
&D1
Not recognized by the T-311.
&D2
Hang up on transition of DTR
This commands the T-311 to hang up the line when it detects an on-to-off transition on the DTR line.
LED follows DTR state.
&F
Fetch default configuration
This command reads the default configuration stored in EPROM into RAM, making it the active con-
figuration. It can then be saved in EEPROM using the &W command.
&W
Write active configuration into EEPROM
This command writes the values in RAM (that is, the current contents of the S registers) into
EEPROM (nonvolatile storage). The next time the T-311 is reset, the values stored in EEPROM will be
loaded. The stored number (see &Z command) is not affected.
For example, AT&F&W reads the factory configuration into RAM (working memory) and stores it in
EEPROM
&Z
Store telephone nNumber
This command stores a telephone number in EEPROM (nonvolatile storage).
The dial string may contain a maximum of 33 characters.
AT&Zn...n<CR>
stores the number n...n (including dial modifiers).
The number is dialed using the command: ATDS<CR>
A/
Repeat last command
This command executes the command string stored in the command buffer, generally for redialing. It
is not preceded by AT.
*A
Display Current Line Status
This command shows the current status of the telephone line and the headset interface. The T-311
must be in V3 mode.
This command obtains a display in the following format:
Line: Off-hook, On-hook, On Hold, or Ringing, DTMF or Pulse Dialing, Mute On or Mute Off (as con-
trolled by T-311, not from the headset)
T-311
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