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3-1
Chapter
3
Communication
Data
Formats
Q
This chapter expands upon information listed in the EPM Modbus Register Map (Chapter 2). Section
Headings (F1, F2, etc) refer to the value in the Register Map’s “Type” column.
3.1:
Type
F1
Null
Terminated
ASCII
String
Q
Length: Depends on the reading.
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Each register contains two bytes. Each byte stands for an ASCII character. The printable portion of
the string is terminated with a Null character (ASCII 00H). Any characters after the terminating
Null are ignored.
Example:
Registers 00001 – 00008, the Device Name, might contain the following data:
3.2:
Type
F2
Fixed
Length
ASCII String
Q
Length: Depends on the reading.
Q
Each register contains two bytes. Each byte stands for an ASCII character. All bytes are significant.
There is no terminating character.
Example:
Registers 00073 – 00074, the EPM Comm Boot Version Number, might contain the following data:
ASCII
Address
Value
Bytes
Register
String
30H 31H 30H 37H 20H 43H 65H 78H 75H 73H 20H 31H 32H 37H 37H 32H
Null‘2’‘7’‘2’‘1’‘ ‘‘s’‘u’‘x’‘e’‘N’‘ ‘‘7’‘0’‘1’‘0’
“2”“27”“ 1”“us”“ex”“ N”“07”“01”
“0107 EPM 9800”
3200H3237H2031H7573H6578H204EH3037H3031H
00001 00002 00003 00004 00005 00006 00007 00008