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Troubleshooting Guide
55
Data Communications Issues
The following information presumes the serial communications link has been set up
using the procedures in Data Communications section. Resolving wiring or
hardware handshaking issues usually requires a RS232 Breakout Box or RS232
Signal Mini-Tester.
PC Reports “Write Fault Error Writing to Device COMx”
When sending a file using commands in a DOS window, the PC will expect
the proper assertion of the hardware control signals DSR and CTS. Verify the
cable correctly connects these signals or jumper these signals to asserted
levels at the PC side. Set the printer’s Flow Control to Xon/Xoff if electing to
jumper control signals on either end of the cable.
Host System Does Not Report Errors, But Nothing Prints
Verify the printer is Online. If the printer was Off-line while sending the file,
send the file again.
Send the file using a terminal emulation program (e.g. Hyperterm). This will
allow viewing of messages returned from the printer. If strange characters
appear, the printer is not using the same baud rate as the host system. Resolve
the baud rate problem and send the file again. If the printer returns legible
error messages, note the errors and correct the PAL label file. Send a simple
known good PAL file to the printer to verify the link.
Use the recommended RS232 test equipment to verify the state of the RS232
control signals and the Receive Data Signal. The Receive Data Signal (RXD)
tester light should noticeably flash during data transfers.