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PANDUIT TDP4*HGMTDPH-MAN
Page 6-6
Section 6: Interface Specifications
RS232C Interface Signals
PIN REFERENCE SIGNAL DEFINITION
1 Reference FG (Frame Ground)
3 To Printer RD (Receive Data) - Data to the printer from the host computer.
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).
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.
PIN ASSIGNMENTS