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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.
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.
Table 8-4: Serial Link (All Protocols) with Honor DSR On
Printer
XON/XOFF Protocol
(Honor DSR On)
DTR Protocol
(Honor DSR On)
DTR/DSR Protocol
(Honor DSR On)
DTR Always active Flow control to computer Flow control to
computer
DSR Data validity Data validity Flow control (transmit
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)
DTR Protocol
(Honor DSR Off)
DTR/DSR Protocol
(Honor DSR Off)
DTR (Output) Always active Flow control to
computer
Flow control to computer
DSR (Input) Ignored Ignored
1
Flow control to computer
CTS (Input) Ignored Flow control from
computer
1
Ignored
1
These values are compatible with Hewlett-Packard Company’s LaserJet printers.