SATO M5900RV Operation Manual page 35

Operation Manual
Ready/Busy Flow Control
Ready/Busy is the hardware flow control for the serial interface on
the printer. 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 4 (RTS) and Pin 20 (DTR) 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.
Cable Requirements
HOST INTERCONNECTION
FG
TD
*
SG
* This connection at the host side of the interface would depend
upon the pin that is being used as the Ready/Busy signal by the
driving software. Typically on a PC, it would be either CTS (pin 5)
or DSR (pin 6) on a DB-25 connector.
Data Streams
Once the flow control method has been chosen for the RS232C
interface, the data stream must be sent in a specific manner. The
STX aznd ETX Control characters must frame the data stream.
<STX><ESC>A..Job#1..<ESC>Z<ETX><STX><ESC>A..Job#n.
.<ESC>Z<ETX>
NOTE: All characters, including STX, ESC and ETX are in
ASCII.
M5900RV
4. Interface Specifications
PRINTER
1 FG (Frame Ground)
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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