Troubleshooting Hints - UART Data Line

TRY ONE OF THE FOLLOWING:
1. Check all TAN (800) wiring for an open or short to ground.
2. Check all data line component connectors for proper terminal contact, beginning with suspect component.
3. Check all data line components ground wiring for HI resistance (caused by poor terminal contact, frayed wires, etc.).
4. Check all data line components, beginning with suspect component.