
Cable Requirements
Data Streams
The data streams for X-On/X-Off are constructed in the same way as they are for
Ready/Busy flow control. The STX and ETX control characters must frame the data
stream (NOTE: All characters, including STX, ESC and ETX are in ASCII).
<STX><ESC>A . . Job#1 . . <ESC>Z<ESC>A . . Job#n . . <ESC>Z<ETX>
Example: <STX><ESC>A . . Job#1 . . <ESC>Z<ETX>XXXXX
BI-DIRECTIONAL COMMUNICATIONS
This is a two-way communications protocol between the host computer and the
printer, thus enabling the host to check printer status. The Bi-Directional flow
control protocol is selected with DSW1-6 and DSW1-7 (see page 3-2).When this
protocol is selected, there is no busy signal from the printer (pin 20, DTR, is always
high). The host must request the complete status from the printer, including
ready/busy. Whenever the host requests printer status, it transmits an ENQ to the
printer and the printer will respond with its status within five milliseconds. If
printing, it will respond upon finishing the current label, then resume printing. In
order for this protocol to work properly, pin 6 (DTR) and pin 5 (CTS) must be held
high by the host. One way to ensure these pins are always in the correct state is to
make no connection to them in the interface cable, or preferably, tie pin 20 (DTR)to
pin 6 (DSR) and pin 4 (RTS) to pin 5 (CTS) at the printer end of the cable.
Cable Requirements
HOST INTERCONNECTION PRINTER
FG
←→
1 FG (Frame Ground)
RD
←
2 TD (Transmit Data)
TD
→
3 RD (Receive Data)
SG
←→
7 SG (Signal Ground)
HOST INTERCONNECTION PRINTER
FG
←→
1 FG (Frame Ground)
RD
←
2 TD (Transmit Data)
TD
→
3 RD (Receive Data)
4 RTS (Request to Send)
5 CTS (Clear to Send)
6 DSR (Data Set Ready)
20 DTR (Data Terminal Ready)
SG
←→
7 SG (Signal Ground)
Section 6. Interface Specifications
Page 6-6 9001034 Rev E SATO “S” Print Engines
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