Rose Electronics Porter - Manual (Page 12)

Installation
8 PORTER INSTALLATION AND OPERATIONS MANUAL
You should have received the Porter switch unit and a power adapter that connects to the
rear of the unit. You should have the necessary cables, supplied separately, to
interconnect the Porter with your other equipment. Ensure that the power switch is in the
off (out) position. Connect the AC power converter to a power outlet. Connect the other
end to the power input on the rear of the Porter.
Cable connection
Using the cables as described below connect your computer to the port labeled "0" on the
rear of the Porter. Connect your peripheral devices to the numbered ports on the rear of
the Porter.
Serial cables
Since industry standards vary regarding RS232 cabling, caution must be observed when
interconnecting your equipment with the Porter. Generally 5 signals or less must be
connected. They are receive, transmit, signal ground, busy in, and busy out. Porter's RxD
(pin 3) must be wired to the equipment transmit and Porter's TxD (pin 2) must be wired to
the equipment receive. Porter's signal ground (pin 7) must be connected to the
equipment signal ground. Busy in and busy out are not required when sing the X-on/X-off
protocol. When X-on/X-off is not used, busy out of the equipment must be wired to DSR
(pin 6) of the Porter and busy in of the equipment must be wired to DTR (pin 20) of the
Porter.
Busy out on the equipment is required to prevent the Porter from sending more data than
the equipment can handle. Conversely, busy in on the equipment prevents the
equipment from sending more data than the Porter can handle. While the Porter is
capable of handling data bursts at maximum baud rates, if it can not resend the data
received as fast as it gets the data, due to the equipment being busy and the input buffer
being full, then busy in on the equipment must be used. Consult your equipment manual
for information on pin numbers of your signals. Several popular cable pin outs are given
in Appendix B.
Additionally the Porter's RTS (pin 4) will be high when the Porter is powered on and may
be used to monitor whether the Porter is connected to your equipment. Refer to
Appendix A for further Porter pin out information. Refer to Appendix B for cable pin out
information. If you have a Porter with the /422 (RS-422) option, refer to Appendix A.
Parallel cables
For a parallel unit the computer to Porter cable is the same one that would normally
connect to your printer. The Porter uses industry standard female Centronics connectors
the same as used on most parallel printers. So, instead of connecting your computer
cable t your printer, connect it to the port on the rear of the Porter labeled "0". Parallel
Porter to printer cables should have 36 pins male Centronics connectors at each end.
Connect these cables from your printers to connectors numbered 1-8 on the rear of
Porter.