
Section 5: Interface Specifications
Page 5-4
XL400/410e Operator’s Manual
5.4 RS232C SERIAL INTERFACE (CONT’D)
Pin Assignments
READY/BUSY Flow Control
Ready/Busy is the hardware flow control for the serial interface on the XL printers.
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.
RS232C 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
protocol).
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 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.
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