HP 24SII - Manual (Page 14)

BayTech sells a high speed serial module for the Model 24SII DES
which supports EIA-422 protocol (M24SII-V07). This allows for long
cable distances using RJ-11 (4-wire) or RJ-45 (8-wire) modular
cabling. Use of the BayTech Tran-x LPT-460 or PS-02 high speed
parallel/serial converter products will allow your PC to transmit data at
460k bps using cable lengths up to 1000 feet. The same set up will
allow your cable distance to be up to 4000 feet if your Tran-x card is
configured to transmit data at 115k bps.
Figure 2 shows a PC with the Tran-x LPT-460 card and a PC with the
Tran-x PS-02 external module connecting to the M24SII-V07 module
via modular cabling.
Figure 2