Appendix B: Master-Slave Protocol
VT400 Technical Manual, Rev. A5 72 Doc # UM-VT400-EN
Master
Transmission
ID SLAVE 3 NYYYYY BCS
N: Setpoint number 1-2 (ASCII)
YYYYY: Setpoint value (ASCII, MSB first)
Slave Response ECHO
4 Command: Upload Setpoint Values
This command uploads setpoint values from the slave to the master.
Master
Transmission
ID SLAVE 4 NXXXXX BCS
N: Setpoint number 1-2 (ASCII)
XXXXX: These bytes are not used; fill with Space character (20h).
Slave Response
ID SLAVE 4 NYYYYY BCS
N: Setpoint number 1-2 (ASCII)
YYYY: Setpoint value (ASCII, MSB first)
5 Command: Read Setpoint Values
This command uploads status for the setpoint outputs.
Master
Transmission
ID SLAVE 5 XXXXXX BCS
XXXXXX: These bytes are not used; fill with Space character (20h).
Slave Response
ID SLAVE 5 12---- BCS
1,2: Status of setpoints 1 and 2: 0 if setpoint is off, 1 if setpoint is
on)
----: Space characters (20h)
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