Athena C10 line Manual de Instruções descarregar pdf (Página 13)

3.7 Read Status (07)

This function is used for reading the status of eight predetermined bits

with a compacted message. Broadcast mode is not allowed.

Question

The message consists only of the slave address and the function code

(07).

Example: Request of the status of slave 25.

ADDR FUNC CRC

CRC

19 07 4B E2

Answer

In addition to the address of the slave and the function code (07), the

message comprises a character containing the status bits.

Example: Answer to the request indicated above.

ADDR

FUNC

DATA

status

byte

CRC

19 07 6D 63 DA

3.8 Force Multiple Coils (15)

This function is used for forcing the status of each binary variable in a

consecutive block. Broadcast mode is allowed.

Question

In addition to the address of the slave and the function code (15), the

message contains the starting address expressed in two bytes, the

number of bits to be written, the number of bytes containing the data and

the data characters. The data are compacted, so one byte contains the

status of 8 bits, the least significant bit of the first byte must contain the

bit corresponding to the starting address and so on. If the number of bits

to be written is not a multiple of 8, the last character must be completed

with zeros in the most significant bits. Address numbering starts from

zero (bit1 = 0) for MODBUS, from one (bit1 = 1) for JBUS.

Example: Request to force 4 bits starting from address 1 on slave 12. Bits

1 and 4 forced to "1" and the others to "0".

ADDR

FUNC

DATA

start

Addr HI

DATA

start

Addr LO

DATA

bit #

DATA

bit #

DATA

Byte

Count

DATA

bit

1..4

CRC

0C 0F 00 00 00 04 01 09 3F 09

Answer

In addition to the address of the slave and the function code (15), the

message contains the starting address and the number of bits written.

Example: Answer to request indicated above.

ADDR

FUNC

DATA

start

Addr HI

DATA

start

Addr LO

DATA

bit #

DATA

bit #

CRC

0C 0F 00 00 00 04 55 15

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 106 107

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