SATO M8485S Operator's Manual download pdf (Page 165)

Cable Requirements

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 and ETX control characters must

frame the data stream.

NOTE: All characters, including STX, ESC and ETX are in ASCII.

X-On/X-Off FLOW CONTROL

X-On/X-Off flow control must be used whenever hardware (Ready/Busy) flow

control is not available or desirable. Instead of a voltage going high/low at pin 20,

control characters representing “Printer Ready” (X-On =11 hexadecimal) or “Printer

Busy” (X-Off = 13 hexadecimal) are transmitted by the printer on pin 2 (Transmit

Data) to the host. The X-On/X-Off flow control protocol is selected with DSW1-6

and DSW1-7 (see page 3-2). In order for this method of flow control to function

correctly, the host must be capable of supporting it. X-On/X-Off operates in a

manner similar to the function of pin 20 (DTR) as previously explained. When the

printer is first powered on and goes on-line, an X-On is sent out. In the Single Job

Buffer mode, when the printer receives a viable job, it transmits an X-Off and begins

printing. When it is done printing, it transmits an X-On. In the Multi Job Buffer

mode, the printer sends an X-Off when the “Buffer Near Full” level is reached and a

X-On when the data level of the buffer drops below the “Buffer Available” mark.

When the printer is taken off-line manually, it transmits an X-Off indicating it cannot

accept data. When it is placed back on line manually, it sends an X-On, indicating it

is again available for receipt of data. If an error occurs during printing (paper out,

ribbon out), the printer sends nothing in the Single Job Buffer mode since the last

character transmitted was an X-Off. When the error is cleared and the printer

resumes printing, no X-On is sent until the current job is completed and the printer is

once again ready to receive the next job. If it is in the Multi Job Buffer mode, it sends

an X-Off as soon as an error condition is detected. When the error is cleared and the

printer is placed back on-line, it transmits an X-On indicating it is again ready to

accept data.

Upon power up if no error conditions are present, the printer will continually send

X-On characters at five millisecond intervals until it receives a transmission from the

host.

HOST INTERCONNECTION 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)

* This connection at the host side of the interface would depend upon the pin that is being used as the Ready/Busy

Section 6. Interface Specifications

SATO “S” Print Engines 9001034 Rev E Page 6-5

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SATO M8485S Operator's Manual Page 165

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