Serial Cable Pin Assignments (Rs-232C) - Lexmark FORMS 249X Technical Reference

Serial Cable Pin Assignments (RS-232C)

The following illustration shows the RS-232C serial cable:
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Serial Adapter Side
RS-232C Serial Connector Pin Assignments
Pin Signal
2 TXD
(Transmit Data)
3 RXD
(Receive Data)
4 RTS
(Request to Send)
5 CTS
(Clear to Send)
6 DSR
(Data Set Ready)
20 DTR
(Data Terminal Ready)
25-Pin
Male
25
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Description
This line transmits data from the printer to the host. The data
characteristics are specified by the function menu settings which are
read only during a Power On Reset (POR). The only data
transmitted are XON (x'11') and XOFF (x'13') signals. Transmission
occurs only when CTS is high.
This line receives data from the host. The serial interface accepts
data only when DSR is On.
This line is set high and remains high even after the serial interface
finishes its POR.
This line is monitored only if the XON/XOFF protocol is selected
because transmission occurs only when CTS is high.
DSR is another method of providing data integrity. Data is accepted
only when DSR is high.
This line is set high after the serial interface finishes its POR
sequence. However, if you select DTR pacing handshake protocol,
this line is used to indicate to the host whether or not the printer is
ready to receive any more data.
25-Pin
D-shell
Female
25
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Computer Side
Section 6: Using the Printer Interface
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