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8. Command and Response Structure
8.2.2 GENERAL COMMAND STRUCTURE
The meter can be commanded to “read”, i.e., to transmit (send) data from either the
nonvolatile memory (EEPROM) or from the volatile working memory (RAM). The meter
can also be commanded to “write”, i.e., store new values for data processing or meter
control.
There are different command types associated in communicating with your meter as
follows:
Type (1) Commands which return non-measurement data from the meter are “R” and “G”.
Type (2) Commands which return measurement data from the meter are “X” and “V”.
Type (3) Commands which return status character data from the meter is “U”.
Type (4) Commands which send non-measurement data to the meter are “P”, “W”, and “Y”.
Type (5) Commands for disable, enable, and reset are “D”, “E”, and “Z”.
Table 8.1. Command Prefix Letters (Command Classes)
COMMAND PREFIX
(COMMAND CLASS) MEANING
^AE Special read, communications parameters
P (Put) Write HEX data into RAM
W (Write) Write HEX data into EEPROM
G (Get) Read HEX data from RAM
R (Read) Read HEX data from EEPROM
U Read status byte
V Read measurement data string in decimal format
X Read measurement data values in decimal format
D Disable
E Enable
Z Reset
Y Write characters or values to the meter
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