Artos CS-327, Руководство пользователя

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If the Imaje responds by setting the DTR hardware line the control continues with the
test.
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If the DTR line does not get asserted the Test stops and displays the DSR/DTR message.

The Control clears the RX buffer for the Ink jet port.

The Control sends the ENQ code (ASCII byte 05h) out the TX line to the printer.

The Control looks for something received in the RX buffer:
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If ACK (ASCII byte 06h) is received this is normal and the test ends indicating this.
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If NAK (ASCII byte 15h) is received this is indication from printer of error. The test ends
and indicates this
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If ENQ (ASCII byte 05h) is received this is indication of TX and RX lines connected
together somewhere. Test ends and indicates this.
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If any other Data than the three codes above is received in the RX buffer the test ends and
indicates this.
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If nothing is received after two (2) seconds the test ends indicating a Time out.
How the Loop back test works:
Disconnecting the TX and RX lines connected at the Imaje industrial interface board and connecting them
together creates a circuit so that the ENQ byte sent out the TX line from the Control port goes back in the
RX line to the control port. For the ENQ test loop back to succeed with the display of ENQ in the results
all the following must be OK:

The Controller port for the ink jet interface lines, DSR,DTR,RX and TX.

Wiring from the controller port to the ARTOS ink jet interface board, lines DSR,DTR,RX and
TX.

The ARTOS ink jet interface, lines DSR,DTR,RX and TX.

Wiring from the ARTOS ink jet interface out to the Imaje Industrial Interface board, lines
DSR,DTR,RX and TX.
If the Loop back works in this case there is most likely a problem with the connection of the RX and TX
lines to the Imaje Industrial interface board, incorrect jumpers on the Imaje Industrial interface board or
something else internal to the Imaje.