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3-3 MODBUS Calibration
RS1-02 set as “4” (MODBUS RTU mode)
RS1-07 set as “01” (scale’s address)
a. CAL Switch set to ON and set 00 CCP = CCP, or
b. CAL Switch set to OFF
Eg:
Zero calibration
Input 01050423FF007CC0 ← zero calibration
Reading calibration status
1. Command: Input 010100410005AC1D
First 01 is scale’s address. Second 01 is command. 00 41 (decimal number 65)
is MODBUS address. 00 05 means continuously inquire 5 addresses, i.e. 65,
66, 67, 68, 69.
2. Scale’s reply: 01010105919B
First 01 is scale’s address. Second 01 is command. Third 01 means reply with
1 byte, i.e. the subsequent 05 is binary 0000 0101 – if first bit is 1, that means
Address 65 (decimal) is set to 1 performing zero calibration, and so on. If
second bit is zero, then span calibration has no action. Please refer to
“Appendix 3: MODBUS Data Address Table”. After zero calibration has finished
without Err message, zero calibration is completed.
Span calibration
Input weight calibration value 3000
Input 0110044C0001020BB8EADE ← Input weight calibration value 3000
Put 3kg on the platter
Span calibration
Input 01050424FF00CD01 ← Span calibration
Reading calibration status
1. Command: Input 0101004200015DDE
2. Scale’s reply: 010101019048
First 01 is scale’s address. Second 01 is command. Third 01 is scale’s reply
byte count. Fourth 01 is binary 0000 0001, which means address – if first bit
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