Basler Electric BE1-700 Modbus Protocol - Manual (Page 24)

1-14 BE1-700 Modbus™ Protocol 9376700991 Rev D
The same byte alignments are required to write.
Long Integer Data Format (LI)
The Modbus long integer data format uses two consecutive holding registers to represent a 32 bit data
value. The first register contains the low-order 16 bits and the second register contains the high-order 16
bits.
Example: The value 95,800 represented in long integer format is hexadecimal 0x00017638. This number
will read from two consecutive holding registers as follows.
Holding Register
K (Hi Byte) hex 76
Value
K (Lo Byte) hex 38
K+1 (Hi Byte) hex 00
K+1 (Lo Byte) hex 01
The same byte alignments are required to write.
Integer Data Format (INT)
The Modbus integer data format uses a single holding register to represent a 16 bit data value.
Example: The value 4660 represented in integer format is hexadecimal 0x1234. This number will read
from a holding register as follows:
Holding Register
K (Hi Byte) hex 12
Value
K (Lo Byte) hex 34
The same byte alignments are required to write.
Short Integer Data Format (SI)
The Modbus short integer data format uses a single holding register to represent an 8 bit data value. The
holding register high byte will always be zero.
Example: The value 132 represented in short integer format is hexadecimal 0x84. This number will read
from a holding register as follows:
Holding Register
K (Hi Byte) hex 00
Value
K (Lo Byte) hex 84
The same byte alignments are required to write.
ASCII Character Data Format (ASC(1))
The Modbus ASCII character data format uses a single holding register to represent a single character
value. The holding register high byte will always be zero with the ASCII character code in the low byte.
Example: The character 'D' represented in ASCII character format is hexadecimal 44. This number will
read from a holding register as follows:
Holding Register
K (Hi Byte) hex 00
Value
K (Lo Byte) hex 44
The same byte alignments are required to write.
ASCII String Data Format (ASC(x))
The Modbus ASCII string data format uses one or more holding registers to represent a sequence or
string of character values. If the string contains a single character, the holding register high byte will
contain the ASCII character code and the low byte will be zero.
Example: The string "PASSWORD" represented in ASCII string format will read as follows: