Technical data

Unit 3: Installation
S8400 Series Operator Manual
3-11 PN: 9001160 (C)
Figure 3-7, Serial Connector Pin Assignments
READY/BUSY INTERFACE SIGNALS
PIN DIRECTION SIGNAL DEFINITION
1 Reference FG (Frame Ground)
2 To Ho s t
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 H o s t
RTS (Request to Send) - Used with Ready/Busy flow control to indicate an error condi-
tion. 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 H o s t
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.
READY/BUSY CABLE REQUIREMENTS
DB9 DB25 HOST DIRECTION DB25 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 Terminal Ready) To Printer DB9-4 5 DSR (Data Set Ready)
6 6 DSR* (Data Set Ready) To Host 6 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.