OKI ML3390 01091308*01256402 사용자 설명서

D-19

Appendix D: Interface Data

Protocol: Ready/Busy
Ready/Busy-Line (printer): SD

HP 24541B

Printer

Menu Settings

SD.A   9

SD.B  10

CB (CTS)   5

RD.B  18

GND 19

SSD+  3

SSD-  21

SD+    4

SD-   22

RD+   6

RD-   24

RS+     7

RS-    25

CS+     9

CS-    27

DM+ 11

DM-  29

TR+   12

TR-    30

CC (DSR)  6

DTR

Ready/Busy

Serial I/F Option Protocol

Busy Line

DSR Signal

Invalid

In this circuit (connection of a HP 24541B interface board with RS-
422A-Interface of the printer) the ports SD.A, Pin 9 and SD.B, Pin 10 are
connected to the ports RD+, Pin 6 and RD-, Pin 24 of the printer inter-
face. These are the two lines for the transmission of the print data.

The two lines for the Ready/Busy-Signal are created by connecting
ports CB (CTS), Pin 5 and RD.B, Pin 18 to the ports TR+, Pin 12 and
TR-, Pin 30 of the printer interface. Additionally a connection to CC
(DSR), Pin 6, is established on the host side from CB (CTS), Pin 5.

Looking at the two Ready/Busy-lines please note the following: al-
though the port RD.B, Pin 18 on the host side is specific for the RS-
422A interface, the second line is connected to the ports CB (CTS),
Pin 5 and CC (DSR), Pin 6 of the RS-232C interface. This ensures the
correct transmission of data with many applications, but it cannot
be guaranteed for all applications.

When printer and software status signals X-ON and X-OFF are
evaluated by an application while this circuit example is used, the
correct data transmission with this type of interface board on the
host side is not possible.