MODBUS REGISTERS
EATON PowerXpert®Gateway Series 1000 Card User’s Guide S164201670 Rev 1 51
STIME – 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
SBOOL – 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 AModbus register contains two bytes.Therefore, the number of registers
containingthe information can be obtained by dividing the bytes by two. For example, the
vendorname in Table 3 on page 54 can be obtained by reading 32 Modbus registers starting
atregister 1001.
NOTE Ifa register is not supported in a particular device, an exception response is
returned.