B&K Precision 1785B - Manual - Manual (Page 24)

24
4.4 Communication protocol
1．Setting the remote control mode (0x20)
1
st
byte Start bit( 0xAA )
2
nd
byte Address(0x00~0xFE)
3
rd
byte Command （0x20）
4
th
byte Operation mode(0 represent front panel operation mode, 1
represent remote operation mode)
5
th
to 25
th
byte System reserve
26
th
byte Check sum
2．Setting the output state ON/OFF (0x21)
1
st
byte Start bit (0xAA )
2
nd
byte Address(0x00~0xFE)
3
rd
byte Command (0x21)
4
th
byte Output state(0 is OFF，1 is ON)
5
th
to 25
th
byte System reserve
26
th
byte Check sum
3．Setting the maximum output voltage (0x22)
1
st
byte Start bit (0xAA )
2
nd
byte Address(0x00~0xFE)
3
rd
byte Command (0x22)
4
th
byte The lowest byte of voltage upper limit (1 represents 1 mV)
5
th
byte The lower byte of voltage upper limit
6
th
byte The higher byte of voltage upper limit
7
th
byte The highest byte of voltage upper limit
8
th
to 25
th
byte System reserve
26
th
byte Check sum
Note: Suppose you want to set the maximum voltage to 16.23 V. Since 1
represents 1mV, therefore 16.23 V translates to 16,230 in decimal. With 4 bytes in
Hex, that would be 0x0003F66. Since the bytes are ordered in little-endian format,
0x66 would be the 3
rd byte, 0x3F the 4 th byte, 0x00 as 5 th byte, and 0x00 as the 6 th
byte.
Note: You cannot control the power supply from the front panel when
the power supply is in calibration mode.