Remote Programming Of The Multimeter By A Computer - Metrix MX 556 Notice De Fonctionnement

Chapter II
5.4.

Remote programming of the multimeter by a computer

WARNING :
5.4.1. General about the protocol
The computer is the master of the link during communication; the computer always takes
the initiative of the dialogue.
Each dialogue is in the following form:
- the computer sends an instruction
- the multimeter answers this instruction.
These two messages pass one after the other, since the link is half duplex.
There are three types of dialogues, firstly the check presence dialogue, then the comments
dialogue and the request dialogue.
5.4.1.1. Check presence dialogue
PC
Instruction
Answer 1
"
Note : The hex code of the ASCII ENQ character = 05H
5.4.1.2. Command dialogue
PC
Instruction
Answer 1
Benchtop multimeter
The accidental sending of certain messages might erase
strategic datas kept in the memory of the multimeter.
In that case, the multimeter might not work properly and it will
have to be sent back to the after sales department or to a
Metrix local agency to be repaired.
The warranty does not cover such a case. Therefore, it is
highly recommended to ensure that the messages whatsoever
are valid and comply with the messages which are given in this
manual.
DMM
ENQ
ACK
The hex code of the ASCII ACK character = 06H
DMM
ENQ
ACK
Meaning
PC: "Are you there?"
DMM : "Yes!"
Meaning
PC: "Execute this comand?"
DMM : "OK!"
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