There seems to be a known issue with communicating between a Micro850 and Panelview800 via RS-232, especially with newer L50E controllers. Here's how to troubleshoot the problem:

1. Check Communication Settings:

• Verify that the serial port settings on both the Micro850 and Panelview800 match exactly. This includes:

• Baud Rate (e.g., 9600)
• Data Bits (e.g., 8)
• Parity (e.g., None)
• Stop Bits (e.g., 1)
• Flow Control (e.g., None)

2. Double-Check Hardware:

• Ensure you're using a null modem cable for RS-232 communication.
• Replace the RS-232 cable to eliminate the possibility of a faulty cable.
• Try connecting the devices with a different Micro850 and Panelview800 (if available) to isolate the problem to a specific unit.

3. Consider Firmware Compatibility:

• While newer L50E controllers might have implicit messaging features, RS-232 communication with Panelview800 might require a specific firmware version on the Micro850. Consult the Rockwell Automation documentation for compatible firmware versions for both devices.

4. Explore Alternatives to RS-232:

• Although less common, some Micro850 models might support Ethernet communication. This can be a more reliable alternative to RS-232.
• Check the specific models you're using for available communication options.