SATO M5900RV Operation Manual page 37

Operation Manual
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>A..Job#1..<ESC>Z<ETX>XXXX
Bi-Directional Communications
This is a two-way communications protocol between the host com-
puter 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 INTERCONNECTION
FG
RD
TD
SG
If a CAN (18 hexadecimal) is received by the printer, it will cancel
the current print job and clear all data from the receive buffer.
M5900RV
4. Interface Specifications
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)
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