Communications
58
515 HC04 - 8 June 2007
Header
The format of the response header from the instrument is as follows:
The instrument
Exception Status
codes that the instrument returns for the
ASCII protocol are the same as those described for the Modbus RTU
protocol in
Data
The format of the data variables from the instrument is as follows:
Note:
The decimal point in the Value is always at character position 8.
Therefore whole numbers are aligned right at the decimal point, with
trailing zeroes.
Variables Request
The variables request asks the instrument to return the value of one or more
requested variables. All totals are transmitted as accumulated totals.
Variables Request and Response Example
The following request is for the only instrument that is connected to the
communication port to return the values of all main menu variables.
8 9 1 2 3 . 4 5 6
M W h
E N E R G Y
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
22
23
24
25
26
27
Value (aligned right)
spa
ce
Unit (aligned left)
spa
ce
Item (aligned left)
Command Description
:RVA?
Return all variables
:RVD?
Return the default Total and Rate
:RV0? …
:RV9?
Return the specific variable. The numbers relate to the
position in the variables menu. For example, V0 is Energy,
V1 is Power and so on.
: A 0 0 1 : R V A ?
L
F
C
R
A001
YYYY/MM/DD
HH:MM:SS 00
Address
Time
Date
space
space
space
Exception Status
(24-hour clock)
Summary of Contents for 515
Page 4: ...iv 515 HC04 8 June 2007 ...
Page 8: ...viii 515 HC04 8 June 2007 ...
Page 16: ...Introduction 8 515 HC04 8 June 2007 ...
Page 60: ...Instrument Calibration 52 515 HC04 8 June 2007 ...
Page 80: ...Communications 72 515 HC04 8 June 2007 ...
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