OKI ML3390 01091308*01256402 User Manual
Product codes
01091308*01256402
D-26
Appendix D: Interface Data
Transmission Protocols
The following pages explain the transmission procedures of the
three different types of protocol.
three different types of protocol.
If the printer is unable to receive data, the current loop for signal B +
opens when the 50
opens when the 50
µ
s following the stop bit of the last character is
received.
Timing Diagram
D+
Stromschleife
offen
offen
Stromschleife
geschlossen
geschlossen
Startbit
Stoppbit
B+
0 mA
15-20 mA
15-20 mA
0 mA
50
µ
s (max.)
Power Loop
open
open
Power Loop
closed
closed
Block format: any
Error Message: a parity error is displayed as @ (4OH).
Display of Busy Status: the minimum interval during which the
printer is unable to receive data is selected in the Busy Time menu.
The interval for the Busy signal can be set to either 200 ms or 1 se-
cond.
printer is unable to receive data is selected in the Busy Time menu.
The interval for the Busy signal can be set to either 200 ms or 1 se-
cond.
The printer is not ready to receive data if the capacity of the inter-
face buffer drops below 521 bytes. The printer is ready to receive
data again when 512 bytes are free in the printer buffer after 200 ms
or 1 s have elapsed. If the memory threshold of 512 bytes is not rea-
ched during the busy status of 200 ms or 1 s, the printer only signals
its ability to receive data when more than 512 bytes of memory are
available.
face buffer drops below 521 bytes. The printer is ready to receive
data again when 512 bytes are free in the printer buffer after 200 ms
or 1 s have elapsed. If the memory threshold of 512 bytes is not rea-
ched during the busy status of 200 ms or 1 s, the printer only signals
its ability to receive data when more than 512 bytes of memory are
available.
Ready/Busy
Protocol
Protocol