Data Formats - Eaton Power Xpert 1000 Series User Manual

EATON Power Xpert
® Gateway Series 1000 Card User's Guide

Data Formats

Modbus programs usually provide an option for viewing various data
types. Refer to your Modbus program documentation for detailed
information on viewing data options.
A register is 16 bits (two bytes). The PDU/RPP/RPM supports the
following data types:
S
STRING – A string of ASCII characters (two per register). Consult the
Size parameter to find the string's length for a given entry (it is a
multiple of two so that entries are register-aligned).
S
FLOAT – A 32-bit IEEE754 floating point number. FLOATs are always
two registers.
S
UINT – An unsigned integer. Consult the Size parameter to find the
integer's size for a given entry (it is a multiple of two so that entries
are register-aligned).
S
TIME – The Time type (ym dh ms) consists of six bytes specifying the
year, month, day, hour, minutes, and seconds. The bytes are stored
in hexadecimal format. If your Modbus application displays the
individual bytes in a register, view the bytes using the decimal option.
Otherwise, the bytes are best viewed by displaying the two-byte
register in a binary format and translating each byte to decimal.
For example, if today is May 17, 2007 and the time is 10:45 and
20 seconds, viewing each hex byte in decimal would yield the
following data, which is viewable as the year (07), month (05),
day (17), hour (10), minutes (45), and seconds (20):
07 05
See "Time or Date (FC 04)" on page 75 for more information.
S
BOOL – A binary (Boolean) value of 0 or 1. BOOL is usually assigned to
discrete input alarms.
17 10 45 20
S
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