Monroe Electronics Electrostatic Fieldmeter - Static Monitor - model 177A - Manual (Page 50)

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The followings are examples of Read Channel command from PC to 177A, ID=1.
The command is 8-byte in length. They are in hex.
Read channel 1:
01 03 00 00 00 01 84 0A
ID Cmd Channel1 crcH crcL
Read channel 2:
01 03 00 01 00 01 D5 CA
ID Cmd Channel2 crcH crcL
Read channel 3:
01 03 00 02 00 01 25 CA
ID Cmd Channel3 crcH crcL
Read channel 4:
01 03 00 03 00 01 74 0A
ID Cmd Channel4 crcH crcL
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Example1: Reply from the 177A. It is 7-byte in length, shown in hex:
01 03 02 00 33 f8 51
ID Cmd 2-byte data dataHi dataLo crcH crcL
01: Unit ID
03: Read channel command
02: two data bytes followed
00: data high byte
33: data low byte. With the previous high-byte: 00 33 is
the channel reading in hex. Its decimal value is 51.
If the channel is set up for a 10kv probe, the display is 0.51.
f8: crc High byte
51: crc low byte
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Example2: Reply from the 177A. It is 7-byte in length, shown in hex:
01 03 02 fe 58 f9 de
ID Cmd 2-byte data dataHi dataLo crcH crcL
01: Unit ID
03: Read channel command
02: two data bytes followed
fe: data high byte
58: data low byte. With the previous high-byte: fe 58 is
the channel reading in hex. Its decimal value is -424.
If the channel is set up for a 10kv probe, the display is -4.24.
f9: crc High byte
de: crc low byte
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