Appendix
99
NC: Not Connected
ND: Not Defined
Ethernet Interface
Communication specifications
10BASE-T/100BASE-TX
Support protocols
28 GND GND GND
29 GND GND GND
30 GND GND GND
31 Host nInit nInit nInit
32 Printer nFault nDataAvail/Data0,4 nDataAvail
33 GND ND ND
34 Printer DK_STATUS ND ND
35 Printer +5V ND ND
36 Host nSelectIn 1284-Active 1284-Active
A prefix “n” to signal names indicates “L” active signals. For the host computer not
provided with all of the signal lines listed above, bidirectional communication fails.
For interfacing, signal lines shall use twisted pair cables with the return sides connected
to signal ground level. Follow the IEEE Std 1284 for the specifications of the interface
cable.
Make sure the signals satisfy electrical characteristics.
Set the leading edge and trailing edge times to 0.5 ms or less.
Data transmission shall not ignore the signal nAck or Busy. An attempt to transmit data
with either signal, nAck or Busy, ignored can cause data loss.
Interface cables shall be the minimum required length and as short in length as possible.
Protocols Usage
IP, ARP, ICMP, UDP, TCP Basic communication protocols
LP, LPR, TCP Socket Port Printing protocols
Pin Source
Compatibility
Mode
Nibble Mode Byte Mode
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