MDI-4000 Series Serial Interface Manual
4.1.8 Troubleshooting UART
Use this table to find possible solutions to common UART problems.
UART Troubleshooting
• Make sure communication settings, such as transfer speed and
character format, are correct.
• Send the Z2 command. Most communication settings do not take effect
until the Z2 command is sent.
• Verify the handshake setting.
No response when
sending command
• Make sure communication settings, such as transfer speed and
character format, are correct.
• Make sure that the code to be read matches to the character code of
the communication tool.
• Make sure the communication settings are correct.
• Check the line-break setting of the communication tool.
4.2 USB-COM
When using the USB-COM interface, make sure the 12-pin FFC cable is connected to the USB
signals. For more information, see “USB-COM Interface Signal” on page 28.
Caution: UART is a standard factory default setting. If the host is using a UART
connection circuit, communication will fail.
4.2.1 How to Switch to USB-COM
When you change the interface to USB-COM, the configuration change persists through a
firmware update.
Use one of these methods to change the serial interface to USB-COM:
• Send this command:
[X.Z[C01[X.ZZ2
• Read this 2D menu barcode:
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