Use with two interfaces | Interfaces |
Use with two interfaces
The “Both interfaces active” mode can be selected in the menu (see [2]).
In this mode the printer buffer is subdivided into two parts with 256 bytes each.
After
If a byte is received first at the serial interface, the parallel interface is blocked by the BUSY signal. The serial interface is active and uses the set protocol.
If a byte is received first at the parallel interface, the serial interface is blocked by the DTR signal (DTR = OFF) or, depending on the protocol, by transmission of XOFF.
A maximum of 256 bytes can be received at the serial interface even though the parallel interface is active. All further bytes are lost except for the byte received last.
If the printer buffer of the serial interface is completely free and if no further data is received within 60 seconds, both interfaces are again available.
If the printer buffer of the parallel interface is completely free and if no further data is received within 60 seconds, the data of the printer buffer of the serial interface is processed and the serial interface is activated.
Programmer Reference Guide |
