Appendix B: Master-Slave Protocol
VT400 Technical Manual, Rev. A5 71 Doc # UM-VT400-EN
1 Command: Upload Tare
This command is used, when the scale is tared, to upload the tare value.
Master
Transmission
ID SLAVE 1 XXXXXX BCS
XXXXXX: These bytes not used; fill with Space character (20h).
Slave Response
ID SLAVE 1 Tare Weight BCS
Tare Weight: 6 bytes (ASCII), including decimal point. Most
significant byte first.
2 Command: Keyboard Emulation
This command performs the operation corresponding to pressing one of a set of keys
on the keypad. SETUP3 parameter 3.5 must be set to 1 (Keyboard Commands
enabled) before this command can be used.
Master
Transmission
ID SLAVE 2 0CXXXX BCS
0: ASCII (30h)
C (the opcode of the key):
1 (31h) [>0<key]
2 (32h) [Tare key]
3 (33h) [P.Tare key]
4 (34h) [Print key]
5 (35h) [ast (total) key]
6 (36h) [fn key]
XXXX: These bytes are not used; fill with Space character (20h).
Slave Response ECHO
3 Command: Download Setpoint Values
This command downloads setpoint values from the master and saves them in the
slave’s memory.
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