Epson EX-1000 User Manual - Page 142
Troubleshooting for Serial Interfaces, Serial Interface Specifications, SpaceO +3V to +27 V
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Troubleshooting for Serial Interfaces Problem Printer prints one character then stops READY light flickers but nothing is printed All printing is garbled Recommendation The EX uses the DIR signal and the X-on/X-off protocol (via TXD) to tell the computer whether it is ready to receive characters or whether it is busy printing. Refer to your computer's documentation and ensure that the computer is using one of these systems. You may also need to check your cable wiring or ask your dealer to do it for you. Data is getting through to the printer although it is not being printed. Make sure that both the printer and computer are using the same baud rate, number of start and stop bits, and the same parity Make sure that both the computer and printer are set to use the same number of data bits per word (8) and that they both use the same parity, baud rates, and number of start and stop bits. Serial Interface Specifications The EX built-in serial interface is an RS-232C asynchronous interface with the following characteristics: Data format 1 start bit Data word length: 8 bits Odd, even or no parity 1 stop bit Signal level Mark (1) -3 V to -27 V Space(O) +3V to +27 V The Serial Interface C-3