Bi-Directional Communications - SATO CL408 Operator And Technical Reference Manual

Section 5. Interface Specifications
Cable Requirements
HOST
FG
RD
TD
SG
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. 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 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
FG
RD
TD
SG
Page 5-6
INTERCONNECTION
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9001035 Rev. E
PRINTER
1 FG (Frame Ground)
2 TD (Transmit Data)
3 RD (Receive Data)
4 RTS (Request to Send)
5 CTS (Clear to Send)
6 DSR (Data Set Ready)
20 DTR (Data Terminal Ready)
7 SG (Signal Ground)
PRINTER
1 FG (Frame Ground)
2 TD (Transmit Data)
3 RD (Receive Data)
4 RTS (Request to Send)
5 CTS (Clear to Send)
6 DSR (Data Set Ready)
20 DTR (Data Terminal Ready)
7 SG (Signal Ground)
SATO CL Series Printers