START
No Communication?
- Check RS232 wiring matches pinout
- Verify baud rate, parity, stop bits
- Confirm correct COM port and driver
- Verify controller address and connection
- Test with known good cable
Connection Established but No Response to Commands?
- Confirm correct execution command used (IEXE, PEXE, CEXE) [g3-gidding...andlewisce | Word]
- Ensure required values are loaded before execution
- Verify controller is in operational state
- Check command sequence order
Initialization Issues?
- Verify all “I” parameters contain valid values
- Execute IEXE after loading parameters [g3-gidding...andlewisce | Word]
- Confirm values are within safe limits
Position Update Problems?
- Ensure POIP and POP contain valid data before PEXE [g3-gidding...andlewisce | Word]
- Execute PEXE to refresh status data
- Verify returned data is not stale (requires execution)
Command Execution Failures?
- Ensure all “C” values are valid before CEXE [g3-gidding...andlewisce | Word]
- Verify command sequence completed
- Confirm correct parameter group used
Incorrect or Stale Data?
- Remember data is only valid after execution commands
- Re-run PEXE to refresh values
- Verify correct mnemonic selection
Write Works but Read Incorrect?
- Note only DV supports read/write operations [g3-gidding...andlewisce | Word]
- Confirm other items are write-only and require execution
- Validate value ranges and format
Controller Not Responding?
- Verify power and controller state
- Check communication module and port
- Confirm proper cable connection
- Try alternate cable or port
END
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