B&K Precision 1785B - Manual - Manual (Page 22)

22
Status packets
When you send a command that does not cause the power supply to send requested
information back to you, you will receive a status packet back. The structure of a status
packet is
Byte 0 Byte 1 Byte 2 Byte 3 Byte 4 to 24 Byte 25
0xAA Address 0x12 Status byte Reserved Checksum
The meaning of the return status byte is defined below:
0x90 Checksum incorrect
0xA0 Parameter incorrect
0xB0 Unrecognized command
0xC0 Invalid command
0x80 Command was successful
Description:
1． Start bit is 0xAA, occupies a byte.
2． Address range is 0x00 to 0xFE，occupies a byte.
3． Command occupies a byte.
a． 0x20----Setting the remote control mode
b． 0x21----Setting the output ON/OFF state
c． 0x22----Setting the maximum output voltage
d． 0x23----Setting the output voltage
e． 0x24----Setting the output current
f． 0x25----Setting the communication address
g． 0x26----Reading the present current/voltage, maximum voltage, setup voltage/current and
operation states of the power supply.
h． 0x27----Enter the calibration mode
i． 0x28----Reading the calibration mode state
j． 0x29----Calibrate voltage value.
k． 0x2A----Sending the actual output voltage to calibration program.
l． 0x2B----Calibrate current value.
m． 0x2C----Sending the actual output current to calibration program
.
n． 0x2D----Save the calibration data to EEPROM.
o． 0x2E----Setting calibration information.
p． 0x2F----Reading calibration information.
q． 0x31----Reading product’s model, series number and version information.
r． 0x32----Restoring the factory default calibration data.
s． 0x37----Enable the local key.
t． 0x12----The return information of command operation in power supply.