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DR300 Operator Manual
77
Ready/Busy
This is the hardware flow control for the serial interface on the DR printers. By
raising/lowering the voltage level on Pin 20 of the RS232 port, the printer notifies the
host when it is ready to receive data. Pin 40 (RS) and Pin 20 (DR) are the important
signals on the printer for this method of flow control. The host must be capable of
supporting this flow control method for it to function properly. The selection of 1 item or
multi items print buffer can be set by DIP switch.
Data stream (ESC + “A” ~ ESC + “Z”) from host might not be fully received by printer
under the following conditions:
• Printer is in printing process during Single Job Buffer Mode.
• Printer is engaged with error condition.
1 : Cable connection
Host Printer
FG 1 FG
RD 2 SD
SD 3 RD
CS 4 RS
RS 5 CS
ER 6 DR
SG 7 SG
DR 20 ER
2 : Input/Output signal explanation
Pin No. Signal
Name
Direction Content
1 F G - Frame ground
2 S D Output Data transmitted from printer to host
3 R D Input Data transmitted from host to printer
4 R S Output “Low” level when error occurs in printer
5 C S Input Always hold “High”
6 D R Input Always hold “High”
7 S G - Signal ground
20 E R Output “High” when printer is ready to receive data
“Low” when various errors occur, when the printer is
offline, and while printing in the Single Job Buffer
Mode. It will also go “Low” when the data in the
buffer reaches the Buffer Near Fall Level
Chapter 10 - Serial Interface