A
Instrument internals
1. LCMX02-1200HC lattice FPGA
2. STM8S00 controller
3. R-2R resistor ladder DAC
4. LM358 opamps
5. AD603AR variable gain output amplifiers
6. 74HC140 TTL driver
7. CH340G USB-serial interface
Figure 4: MHS-5200A main circuit board
B
MHS-5200A serial protocol
This is a copy of Al Williams’ work at https://github.com/wd5gnr/mhs5200a
The manufacturer claims that the communication protocol is open and non-
proprietary, but as of July 2015 this is the only known description.
MHS5200A shows up as normal serial port (e.g., /dev/ttyUSBx on Linux),
The communication settings are:
18
