MM-400A
12. Data Communication
12-22
(4) Communication Protocol (Bi-Directional
Communication)
When TWO WAY is selected for MODE in the COMMUNICATION (2) screen, data is
read or written according to the call from the host computer side. However, data can be
read or written in unit of screen and cannot be done in unit of item.
Readable data
1) MEASUREMENT to 6) HISTORY OUT OF LIM of (3) Communication Protocol
(Single-Directional Communication)
1) BASIC SETUP to 12) ENVELOPE of (4) Communication Protocol (Bi-Directional
Communication)
Writable data
1) BASIC SETUP to 11) INTERNAL MEMORY of (4) Communication Protocol
(Bi-Directional Communication)
In data writing, a newly set data is returned from the MM-400A for check. The returned
data is the output data. When a wrong data is written, currently set value is returned for
check. Perform the next communication after confirming that the data is returned. (When
a part of telegraphic message is wrong, normal data is converted and sent back, and the
wrong data returnes the setting value.)
(Note 1) When the decimal point setting is changed from “.” (period) to “,” (comma),
delimiter between items is changed from “,” (comma) to “:” (colon).
(Note 2) Only for WAVEFORM, CURR ALL CYCLE, and FORCE ALL CYCLE, [EOT] is
added at an end of the data.
(Note 3) When using the bi-directional communication, check the following restrictions.
• PROG mode
Timing for the bi-directional
data communication
Restrictions
Not during screen operation None
During the bi-directional data
communication
After completing the response of the previous data
communication, perform the next data communication.
• MEAS mode
Timing for the bi-directional
data communication
Restrictions
During measurement Do not perform communication.
After measurement
Do not perform communication while rewriting the screen.
- The rewrite time changes depending on the item to
display. Start communication after the rewriting is
completed. (Refer to Chapter 11, “(6) Bi-Directional
Communication after Measurement.”)
Do not perform communication while sroting in the USB or
the internal memory.
- The storage time of the USB changes depending on the
item to store. Start communication after the storing dislay
(“USB” displayed in orange at the upper part of the
screen) is turned off.
- The storage time of the internal memory changes
depending on the item to store. Start communication after
the storing dislay (“MEM” displayed in orange at the upper
part of the screen) is turned off.
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