Hioki DSM-8542, Инструкция по эксплуатации, Страница: 112 / 140

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Example 2: When reading data after making measurement three times in the
Manual Trigger mode, send “MTG ; MTG ; MTG.” Then read data
three times or repeat data readout.
[Notes]
1. Caution for output queue readout
When reading data from the output queue, the DSM-8542 adds a delimiter to each data
group and all data cannot be read in one readout. For this reason, the MAV bit is used
to check data presence and process data readout for the required number of readout
cycles using the MAV bit.
When one command is executed, data of the output queue is only one data group and
caution is not needed.
2. Caution when continually executing commands
When executing commands that have response data, send the commands in one line by
separating them by “,” as shown earlier. An error will result and only the result of the
last command is obtained if “MTG” is sent three times or a similar transmission method
is used.
3. Necessity for detection of end of command processing
The DSM-8542 cannot receive a next command while processing a command that has
been received earlier. If a command is received while reception is disabled, handshake
is temporarily performed and NRFD is locked in a receive disable state till reception is
enabled, to let the talker wait. This means that a bus is exclusively owned till
processing of the DSM-8542 ends and the system speed becomes slow. For these
reasons, detection of end of processing is necessary.