Sewha SI 300 - Command Mode Example (Write Commands)

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SI 300 Wall mounting / Desk type DIGITAL WEIGHT INDICATOR
All Read/Write command must be use “HEX CODE”..
How to Calculate Check sum.
- Sum the value from “STX” to “ETX” and converts to ASCII(2byte) and transfer.
Convert the Sum value(HEX) to ASCII and transmit(28byte) .
ex) The sum HEX value from STX to ETX(02,30,31,52,43,57,54,03) is 1A6h.
Then, divide 1A6h by 100h(1A6h/100h). the rest of result is A6h.
Calculated remainder value is A6h, then convert A6h to ASCII, 41(A), 36(6), and transfer.
WRITE COMMAND
Ex) SP1 Setting Command, ID No : 01, New SP1 Set value : 0.600kg
1) PC Write command format (STX ID WPR1 000.600 ETX) “CHECK SUM” not use.
PC transmits to SI300
SI300 Response to PC
Normal operation Incorrect operation
1) PC Write command format (STX ID WPR1 000.600 ETX) “CHECK SUM” use.
PC transmits to SI300
SI300 Response to PC
Normal operation Incorrect operation