SATO M5900RV Operation Manual page 34

4. Interface Specifications
Electrical Specifications
Connector
Cable
Signal Levels
Pin Assignments
RS232C Interface Signals
PIN DIRECTION
1 Reference FG (Frame Ground)
2 To Host
3 To Printer
4 To Host
5 To Printer
6 To Printer
7 Reference SG (Signal Ground).
20 To Host
34
DB-25S (Female)
DB-25P (Male), 5m or less length. For cable configu-
ration, refer to Cable Requirements appropriate to the
RS232C protocol chosen.
High = +5V to +12V
Low = -5V to -12V
SIGNAL DESCRIPTION
TD (Transmit Data) - Data from the printer to the host com-
puter. Sends X-On/X-Off characters or status data (Bi-
Directional protocol).
RD (Receive Data) - Data to the printer from the host com-
puter.
RTS (Request to Send) - Used with Ready/Busy flow con-
trol to indicate an error condition. RTS is high and remains
high unless the print head is open, (in this case, RTS
would return to the high state after the print head is closed
and the printer is placed back on-line) or an error condition
occurs during printing (e.g. label out).
CTS (Clear to Send) - When this line is high, the printer
assumes that data is ready to be transmitted. The printer
will not receive data when this line is low. If this line is not
being used, it should be tied high (to pin 4).
DSR (Data Set Ready) - When this line is high, the printer
will be ready to receive data. This line must be high before
data is transmitted. If this line is not being used, it should
be tied high (to pin 20).
DTR (Data Terminal Ready) - This signal applies to Ready/
Busy flow control. The printer is ready to receive data
when this pin is high. It goes low when the printer is off-
line, either manually or due to an error condition, and while
printing in the Single Job Buffer mode. It will also go low
when the data in the buffer reaches the Buffer Near Full
level.
Operation Manual
M5900RV