Laurel Electronics LAUREATE SERIES Serial Comunications User Manual
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At the end of the complete transmission, the latched RTS value is reset false, even though the RTS
line may be high at that instant. The RTS latch does not go true again until the RTS line is first
returned to a low level after the completion of the transmission and then is taken high again. Latched
control provides “print command” operation by sending a transmission for each RTS pulse. If a
second pulse occurs during the transmission, it is not recognized.
XON/XOFF
A measurement transmission is enabled by the receipt of an ASCII XON character, and disabled
by the receipt of an ASCII XOFFcharacter.
COMMAND MODE
In this mode, the meter does not send any data automatically, but instead responds to commands
it receives from the host computer. These commands can be:
To transmit the latest or peak measurement,
To reset itself completely or just the peak value and/or the latched alarms,
To display a value sent from the computer,
To transmit present setup parameters,
To receive new setup parameters, and
To monitor or alter data in selected memory locations of the meter.
The selection of either the Continuous mode or the Command mode can be made from the front
panel Menu selection “Ser 2”,
Note: The meter will not respond to a command in the Continuous mode except the command “A1”
which puts the meter into the Command mode.
5.2
COMMAND MODE FORMAT
The command mode formats are required only by those users desiring to write custom software
for reading or controlling the meter or changing setup parameters. Software is available that is
easy to use and doesn’t require programming for those that can accept the format in which it is
presented. For those wishing to do their own custom programming using the meter’s commands,
the following information lists the commands and their format.
Note (for the Counter only): After any command that causes a Meter Reset such as C0, F, W,
X, the Counter sends an “R” character after the Reset is complete and the Counter is
ready to accept a new command.
The minimum format is 4 characters:
Example:
*
5A1
CHAR 1 - COMMAND IDENTIFIER
All commands begin with “
*
” followed by the meter address, then a command letter followed by a
sub-command number or letter. Additional characters may be appended. All commands terminate
with
RS232/485 serial port but will still recognize the “
*
”
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