7I90HD 16
OPERATION
PC HOST ADAPTER
In order to run any of the serial command line utilities a RS-422 adapter is needed.
Mesa can provide a suitable adapter. Two such adapters are 3I21 or 3I22. These adapters
connects the RJ-45 RS-422 interface on the 7I90HD to a DB9 serial port (3I21) or USB
port (3I22) and provide 5V link power.
MINIMAL HOST PC ADAPTER
A simple home made host adapter can be made by directly connecting RS-232
signals from a 9 pin PC serial port or USB RS-232 adapter to the 7I90HD’s RS-422
signals via a one ended CAT5 cable. A single resistor between RS-232 TXD and RS-422
RXB is needed to prevent overloading the RS-232 TXD output
CAT5 PIN DE-9F PIN CAT5 SIGNAL DE-9F SIGNAL CAT5 COLOR
1 5 RXA GND ORANGE WHITE
2 3 RXB (1) TXD (1) ORANGE
3 XX TXA XX GREEN WHITE
4 5 GND GND BLUE
5 5 GND GND BLUE WHITE
6 2 TXB RXD GREEN
7 XX +5V (2) XX BROWN WHITE
8 XX +5V (2) XX BROWN
Notes:
1. Connect via 470 Ohm 1/4 watt resistor. All other signals directly connected
2. If not supplied by the adapter, +5V power must be supplied via the 7I90HDs 5V power
connector P7
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