Lexmark X644e User Guide
Interfaces
8-24
Protocol (RS-232C)
Table 8-4 shows the state or function of each serial interface signal in the three data
flow control protocols when the Honor DSR setting is On.
flow control protocols when the Honor DSR setting is On.
Table 8-5 shows the state of each serial interface signal in the three data flow control
protocols when the Honor DSR setting is Off.
protocols when the Honor DSR setting is Off.
Table 8-4: Serial Link (All Protocols) with Honor DSR On
Printer
XON/XOFF Protocol
(Honor DSR On)
(Honor DSR On)
DTR Protocol
(Honor DSR On)
(Honor DSR On)
DTR/DSR Protocol
(Honor DSR On)
(Honor DSR On)
DTR
Always active
Flow control to computer
Flow control to
computer
computer
DSR
Data validity
Data validity
Flow control (transmit
mode) to computer
(receive mode)
mode) to computer
(receive mode)
CTS
Ignored
Flow control from computer
Ignored
Table 8-5: Serial Link (All Protocols) with Honor DSR Off
Printer Signal
XON/XOFF Protocol
(Honor DSR Off)
(Honor DSR Off)
DTR Protocol
(Honor DSR Off)
(Honor DSR Off)
DTR/DSR Protocol
(Honor DSR Off)
(Honor DSR Off)
DTR (Output)
Always active
Flow control to
computer
computer
Flow control to computer
DSR (Input)
Ignored
Ignored
1
Flow control to computer
CTS (Input)
Ignored
Flow control from
computer
computer
1
Ignored
1
These values are compatible with Hewlett-Packard Company’s LaserJet printers.