Oki ML3390, User Manual

Page: 314 / 349

D-27
Appendix D: Interface Data
X-ON / X-OFF
Protocol Timing diagram
512
(mindestens 200 ms bzw. 1 s)
Busy-Signal
0 mA
15 - 20 mA
Schwellenwert der
Anzahl Zeichen
im Puffer
Pufferkapazität
8 KBytes
Daten Daten
Block format: unblocked
Error message: a parity error is displayed as @ (40H).
Display of Busy Status: as soon as the capacity of the interface buff-
er drops below 512 Byte, the printer sends a DC3 signal to the
sender indicating that no data can be received. The signal DC3 is
only sent as long as data is sent to the printer (see note).
If after 200 ms or 1 s, 512 bytes or more memory is available, the
printer sends the signal DC1 to the sender indicating that it is
ready to receive data. The signal DC1 is only sent as soon as 512
Byte or more memory is available. (Select the setting 200 ms or 1 s
in the Busy Time menu.)
Timing diagram
Buffer Capacity
8 KBytes
Capacity of I/F
Buffer
200 ms - 1 s.
Datenempfangs-
kreis D+ -> D-
Daten Daten
DC3
DC3
*
0 mA
15 - 20 mA
(mindestens 200 ms bzw. 1 s)
DC3
DC1
0 mA
15 - 20 mA
Datensende-
kreis B+ -> B-
200 ms - 1 s.
Data Receive
Buffer D+ -> D-
Data Send
Buffer B+ -> B-
* If data is sent while the printer is unable to receive data, the code
DC3 is sent every time data arrives at the printer.