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Unit 3: Installation
SATO GT4xxe Series Operator Manual PN 9001138C Page 3-7
Figure 3-4, Serial Interface Pin Assignments
RS232C SERIAL INTERFACE SIGNALS
PIN DIRECTION SIGNAL DEFINITION
1 Reference FG (Frame Ground)
2 To Host TD (Transmit Data) - Data from the printer to the host computer. Sends X-On/
X-Off characters or status data (bi-directional protocols).
3 To Printer RD (Receive Data) - Data to the printer from the host computer.
4 To Host RTS (Request to Send) - Used with Ready/Busy flow control 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., ribbon out, label out).
5 To Printer 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).
6 To Printer 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).
7 Reference SG (Signal Ground)
20 To Host DTR (Data Terminally 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.
CABLE REQUIREMENTS
DB9 DB25 HOST CONNECTION DB9 PRINTER
1 1 FG (Frame Ground) Bi-Directional 1 FG (Frame Ground)
2 3 RD (Receive Data) To Host 2 TD (Transmit Data)
3 2 TD Transmit Data) To Printer 3 RD (Receive Data)
8 5 CTS (Clear To Send) To Printer DB9-6 4 RTS (Request to Send)
4 20 DTR (Data Temrinal Ready) To Printer DB9-4 6 DSR (Data Set Ready)
6 6 DSR* (Data Set Ready) To Host 9 DTR (Data Terminal Ready)
5 7 SG (Signal Ground) Bi-Directional 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 signal by the driving software. Typically, on a PC, it would be either CTS (pin5) or DSR (pin
6) on a DB-25 connector.
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