Eaton Electrical 1000 - Manual (Page 55)

MODBUS REGISTERS
EATON Power Xpert ® Gateway Series 1000 Card User’s Guide S 164201670 Rev 1 51
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TIME – The Time type (ymdhms) 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 17 10 45 20
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BOOL – A binary (Boolean) value of 0 or 1. BOOL is usually assigned to
discrete input alarms.
Data Addressing
The register addresses and sizes listed in Table 3 through Table 9,
starting on page 54, specify an address for each entry. If a data type
spans multiple registers (such as a FLOAT), lower addressed registers
map to higher-order parts of the value. Within each register, data is in
most significant bit (MSB) first format.
NOTE A Modbus register contains two bytes. Therefore, the number of registers
containing the information can be obtained by dividing the bytes by two. For example, the
vendor name in Table 3 on page 54 can be obtained by reading 32 Modbus registers starting
at register 1001.
NOTE If a register is not supported in a particular device, an exception response is
returned.