Basler-electric BE1-851 Modbus Protocol Instrukcja Użytkownika Pobierz pdf (Strona 16)

1-8 BE1-851 Modbus™ Protocol 9289900992 Rev F

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

Value

K (Hi Byte) hex 00

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:

Holding Register

Value

K (Hi Byte) ‘P’

K (Lo Byte) ‘A’

K+1 (Hi Byte) ‘S’

K+1 (Lo Byte) ‘S’

K+2 (Hi Byte) ‘W’

K+2 (Lo Byte) ‘O’

K+3 (Hi Byte) ‘R’

K+3 (Lo Byte) ‘D’

Example

: If the above string is changed to “P,” the new string will read as follows:

Holding Register

Value

K (Hi Byte) ‘P’

K (Lo Byte) hex 00

K+1 (Hi Byte) hex 00

K+1 (Lo Byte) hex 00

K+2 (Hi Byte) hex 00

K+2 (Lo Byte) hex 00

K+3 (Hi Byte) hex 00

K+3 (Lo Byte) hex 00

The same byte alignments are required to write.

Bit Mapped Data Format (BM (x))

The bit mapped data format uses two or more holding registers to represent a sequence of bit values.

The Modbus™ Bit Map data format can represent an 8 bit, 16 bit, 32 bit, or 64 bit value.

Example

: The Bit Map value of the hexadecimal number 0x123456789ABCDEF0 using a BM64 format

will read as follows:

Holding Register

Value

K (Hi Byte) 0x12

K (Lo Byte) 0x34

K+1 (Hi Byte) 0x56

K+1 (Lo Byte) 0x78

K+2 (Hi Byte) 0x9A

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 69 70

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