Information

VC870 Protocol
 communication interface.
1. Baud rate of RS232 serial interface is 9600 bits / S, a frame message is 10 bit: no parity, 1 bit start bit (0), 8
data bits (low bit onward) (1), 1 bit stop bit (1).
mcu transmission packet format
1 Function rs232_dat[0]
2 Function Select Function_ select rs232_dat[1]
Function code Function_ select code Measurement mode
0x30 (0110000) 0x30 (0110000) DCV
0x30 (0110000) 0x31 (0110001) ACV
0x31 (0110001) 0x30 (0110000) DCmV
0x31 (0110001) 0x31 (0110001) Celsius ()
0x32 (0110010) 0x30 (0110000) ResistanceOHM
0x32 (0110010) 0x31 (0110001) Short-circuit testCTN
0x33 (0110011) 0x30(0110000) CapacitanceCAP
0x34 (0110100) 0x30 (0110000) DiodeDIO
0x35 (0110101) 0x30 (0110000) Frequency
0x35(0110101) 0x31 (0110001) (4~20mA)%
0x36 (0110110) 0x30 (0110000) DCuA
0x36 (0110110) 0x31 (0110001) ACuA
0x37 (0110111) 0x30 (0110000) DCmA
0x37 (0110111) 0x31 (0110000) ACmA
0x38 (0111000) 0x30 (0110000) DCA
0x38 (0111000) 0x31 (0110000) ACA
0x39 (0111001) 0x30 (0110000) Active power +Apparent power
0x39 (0111001) 0x31 (0110000) Power factor+ Frequency
0x39(0111001) 0x32(0110000) Voltage effective value +current effective value
3 Main Display Range rs232_dat[2]
code
DCV ACV DCmV OHM CAP DCuA DCmA DCA ACuA ACmA ACA W
0110000
4V 4V 400mV 400Ω 40nF 400uA 40mA 10A 400uA 40mA 10A
0110001
40V 40V 4KΩ 400 nF 4000uA 400mA 4000uA 400mA
0110010
400V 400V 40KΩ 4000 nF
0110011
1000V 1000V 400KΩ 40uF
0110100
4MΩ 400μF
0110101
40MΩ 4mF
0110110
40mF
4 Main display value DISP1_DIGIT4~DISP1_DIGIT0 rs232_dat[3] rs232_dat[4] rs232_dat[5] rs232_dat[6]
rs232_dat[7]
5 Auxiliary display value DISP2_DIGIT4~DISP2_DIGIT0 rs232_dat[8] rs232_dat[9] rs232_dat[10] rs232_dat[11]
rs232_dat[12]
Parameters code
0 0110000
1 0110001
2 0110010
3 0110011
4 0110100
5 0110101
6 0110110