Lantronix MPS100 EPS Reference Manual - Page 204
B.6.1, Bitmap Graphics
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PostScript Problems Troubleshooting PostScript printers will silently abort jobs if they detect an error. Table B-6: PostScript Troubleshooting Area to Check Explanation The Server is communicating with the printer The printer is configured to use 8-bit characters Service Characteristics Port Counters To test a PostScript printer, use the Test Port 1 PostScript Count 2 command. This command will send 2 pages of PostScript data out the parallel port. Watch the indicators on the printer to verify that the Server is communicating with the printer. If the printer is capable of bidirectional communication, use the Test Service Server_xxxxxx_PS PostScript Count 5 command. This will transfer data both to and from the printer. Autoselection must be disabled and the printer must be configured as a PostScript printer for this test to succeed. If special characters or bitmaps are not printing correctly, the printer may be incorrectly configured to use 7-bit characters. Issue the Show Service Characteristics command. If the service rating is zero, the parallel port is in use. Verify that the PostScript characteristic and appropriate protocols have been enabled on the service. If PostScript jobs appear to print but nothing comes out of the printer, verify the amount of data sent from the host. Issue the appropriate print command from the host system. After the job has completed, use the Show Port 1 Counters command. The bytes output value should be approximately 171 bytes greater than the size of the file on the host system. These numbers are only approximate, but will show that data is flowing to the printer. B.6.1 Bitmap Graphics If files that contain embedded bitmap graphics do not print correctly, it is probably because the bitmaps are being sent as actual binary data and binary data cannot be printed via serial or parallel interfaces. Most major application packages have provisions to print using either binary postscript (for printers connected to the network via LocalTalk) or hex postscript (for printers connected to the network via a serial port or parallel port). If your application does not have this provision, ask the application vendor for an upgrade version or "patch" that will add the hex postscript function. B-4