The ifhp filter supports the AppSocket protocol used by Tektronix. You will need a printcap similar to the following:
phaser: :sd=/var/spool/lpd/%P # need a dummy device for output :lp=/dev/null # You need to specify the IP address of the printer's network interface # In this example it is 10.0.0.1 - replace with the correct value # The filter will actually open the connection. :filter=/usr/local/libexec/filters/ifhp :ifhp=dev=10.0.0.1%9100,model=tek