Auber Instruments SYL-53X2P Podręcznik uzupełniający - Strona 4

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AUBER INSTRUMENTS

4. Function code examples

Note: Two function codes are available for this controller: 03 (0x03) and 06 (0x06). Function code 03 (read holding registers) and 06

(present single register/write register). For details, please check

4.1. Function code 03: Read parameter value from the controller

Function code 03 is used to read the parameter value from the controller. Please note, the query message (sent by host) has a length of 8-byte and

the response message (sent by PID) has a length of 7-byte.

Example: Read the current PV value from the controller:

Data sent by host (query):

Data received from PID (response): 01 03 02 03 7A 39 57

Table 4.1 Example for function code 03

By the response message, the current stored PV value was 037A (hex) or 890 (decimal). PV is in decimal format, so the actual display temperature

is 89.0 degree.

4.2. Function code 06: Write new parameter value to the controller

Function code 06 is used to write new parameter value to the controller. The query message (sent by host) and the response message (sent by

PID) both have a length of 8-byte. After the controller received the query message correctly, controller will reply the exact same message to the

host.

Example #1: Write 550.5 degree as new alarm 1 temperature (AL1) value to the controller. AL1 parameter is in decimal format, so the stored value

is 5505 (decimal) or 1581 (hex). The replied data will be the same as sent data.

Data sent by host (query):

Data received from PID (response): 01 06 00 01 15 81 16 FA

Example #2: Change the display temperature unit from Celsius to Fahrenheit. The address for parameter CF is 0011. Change it to 0 for Celsius

display and change it to 1 for Fahrenheit display.

Data sent by host (query):

Data received from PID (response): 01 06 00 11 00 01 18 0F

2020.09

01 03 10 01 00 01 D1 0A

Target Address

Function

Target Address

Function

01 06 00 01 15 81 16 FA

Table 4.2.1 Example 1 for function code 06

Target Address

Function

Target Address

Function

01 06 00 11 00 01 18 0F

ModBus

Protocol.

Query Message

Parameter Address

Number of words

1001

0001

Response Message

Data Length

Data

037A

Query Message

Parameter Address

Number of words

0001

1581

Response Message

Parameter Address

Number of words

0001

1581

WWW.AUBERINS.COM

CRC16

D10A

CRC16

3957

CRC16

16FA

CRC16

16FA

P4/5