Communication solutions for power utilities
UNIVERSAL POWER-LINE CARRIER SYSTEM TYPE OPU-1
WHOLE BAND QAM MODEM MBPU - Rev. 0 (July 2011)
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5 PROGRAMMING
The modem configuration includes the operation options selected for a particular
application. When working with the V.24 interface, connector J1 of the ZQBT block, this
configuration can be modified by means of the AT commands, from a compatible Personal
Computer (PC) that has a communications emulator program, such as for example
HyperTerminal
.
When working with the AT commands, the modem interface allows the speed, parity and
character length used by the programming PC, according to on the AT header of each
command user, to be automatically adapted. The automatic length and parity adaptive
procedure is capable of detecting characters of 7 and 8 bits and even parity, odd parity, or
none and speeds of between 75 and 38400 bit/s. If this procedure is not carried out the
modem remains configured at the speed and parity specified in the S23 register, or at those
in which the profile recording command AT&W has been introduced.
5.1 AT
COMMAND
5.1.1
Format of the AT commands
When working with the AT commands, with the exception of command A/, each command
transmitted by the PC must start with the AT sequence of characters and must end with a
return. The commands can be transmitted in either capital letters or small letters. A
command can be aborted at any time by introducing <CTRL X>.
The AT sequence can be followed by a list of commands in sequence, separated or not by a
space, except for the Z commands, as the commands that follow these last ones will be
ignored. The maximum number of characters in any line of commands is 75, including A and
T. If a syntax error is detected in any command, the rest of the line is ignored and an
ERROR message is sent to the PC. The blank spaces in a command will be ignored.
Before sending another command wait for the result of the previous one.
