Hi-
I'm new to LV yet, I'm trying to write an application that interfaces with an HP multimeter and a Mettler-Toledo FP90 temperature controller. Each device has a serial port dedicated to it. The interface driver to the HP multimeter I found was already included as an example in LV5.1, however I could not find any intrument drivers or code to interface with the Mettler FP90 (if anyone knows where I can get it, I'd greatly appreciate it) However, I do have a document from Mettler detailing how to control remotely and the commands.
I've managed to interface with both machines at the same time. However, there is no query function for the M-T FP90 so I have to continually read the serial port for a trigger code. The
trigger code that I thought appropriate would be the change of status code that would correspond to "beginning temperature program"
According to the Mettler-Toledo document on remote control of the FP90 the change of state report is in the form of U\s#####\s#####\r\n
The following is their definition:
" The first value represents the curren state of the FP90's internal state machine. It is a decimal unsigned integer, composed of two byte values representing the current state of the two state machines in the FP90 firmware, (the second value has not been defined yet)."
They continue to say:
"The high order byte represents the user interface state machine, the low order byte represents the cell control state machine."
They also list numbers that represent different states. The high order bytes has 0 to 43 and the low order byte has 0 to 16 entries.
As you probably guessed, I'm new to this, so I was wondering if someone could help me understand what the above quotes me
an, specifically what could they mean by high and low order bytes?
Much appreciated,
F. Asfour
