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Common function codes<br />
03H:Read the register contents<br />
Continuous read N words. * Largest number of N is 29 (1DH)<br />
Ex.: Read two words ( register 0200H and 0201H ) from Slave address 01H.<br />
ASCII Mode<br />
Query PC Servo Response Servo PC OK) Servo PC (ERROR)<br />
STX ‘ : ’ STX ‘ : ’ STX ‘ : ’<br />
ADR<br />
‘ 0 ’ ‘ 0 ’ ‘ 0 ’<br />
ADR<br />
ADR<br />
‘ 1 ’<br />
‘ 1 ’<br />
‘ 1 ’<br />
Function Code<br />
‘ 0 ’ ‘ 0 ’ Function ‘ 8 ’<br />
Function Code<br />
‘ 3 ’<br />
‘ 3 ’<br />
Code ‘ 3 ’<br />
‘ 0 ’ Data length ‘ 0 ’ Exception ‘ 0 ’<br />
(Hi)<br />
Register<br />
‘ 2 ’<br />
(byte) ‘ 4 ’<br />
code ‘ 2 ’<br />
ADD.<br />
‘ 0 ’ ‘ 0 ’ ‘ 7 ’<br />
(Lo)<br />
Data of (Hi)<br />
LRC<br />
‘ 0 ’<br />
‘ 0 ’<br />
‘ A ’<br />
0200H<br />
‘ 0 ’ ‘ B ’ END1 (CR) (0DH)<br />
(Lo)<br />
Data length ‘ 0 ’<br />
‘ 1 ’ END0 (LF) (0AH)<br />
(word) ‘ 0 ’ ‘ 1 ’<br />
Data of (Hi)<br />
‘ 2 ’<br />
‘ F ’<br />
0201H<br />
‘ F ’ ‘ 4 ’<br />
LRC<br />
(Lo)<br />
‘ 8 ’<br />
‘ 0 ’<br />
END1 (CR) (0DH) ‘ E ’<br />
LRC<br />
END0 (LF) (0AH)<br />
‘ 8 ’<br />
END1 (CR) (0DH)<br />
END0 (LF) (0AH)<br />
RTU Mode<br />
Query PC Servo Response Servo PC (OK) Servo PC (ERROR)<br />
ADR 01H ADR 01H ADR 01H<br />
Function Code 03H Function Code 03H Function Code 83H<br />
Register (Hi) 02H Data (Byte) 04H Exception 02H<br />
ADD (Lo) 00H Data of (Hi) 00H CRC(Lo) C0H<br />
Data length 00H<br />
0200H (Lo) BAH CRC(Hi) F1H<br />
(word) 02H Data of (Hi) 1FH<br />
CRC(Lo) 04H<br />
0201H (Lo) 40H<br />
CRC(Hi) 07H CRC(Lo) A3H<br />
CRC(Hi) D4H<br />
7-8
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