Some TCP/IP-attached printers, in addition to the LPR/LPD protocol, also support a simple protocol for receiving one buffer of raw print data at a time over port 9100 or other ports. HP calls this protocol for TCP/IP Direct Mode printing. Other vendors call this protocol Reverse Telnet, Direct Sockets Interface, TCP/IP Stream protocol, or TCP/IP socket gateway.
If your printer supports bi-directional PJL, then use the PJL5 print driver instead of the DSO print driver.
Activate this support by specifying TCPDRIV=DSO in the printer node definition. This performs the same functions as the standard LPR printer driver.
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