AvaLAN Wireless AW900R4-EVAL - Manual (Page 13)

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User’s Manual AW900R4-EVAL
a “port closed” error, but no harm will be done.
6. You will need a serial data source program installed on your PC. If you are run-
ning Windows XP, hyperterm is already there and makes a good data source.
Unfortunately, Microsoft has discontinued inclusion of hyperterm and you will
need another alternative for later versions of Windows. There are many avail-
able for free or at low cost and they may be found by Internet search. The one
we used in our setup was Tera Term, a free terminal emulator whose latest ver-
sion can be downloaded from sourceforge: ttssh2.sourceforge.jp. The terminal
emulator program should be configured to connect to the Virtual COM port of
the Serial Converter and its serial port properties like Baud rate, data bits, etc.
should match the configuration settings in the AW900R4. It is also useful to set
local echo and CR-LF end-of-line for transmit and receive.
7. When everything is connected properly and all the software pieces are in
place, you should be able to type characters into the terminal emulator on
one PC and see them appear in the terminal emulator window on the other PC.
Tera Term also supports text file transfers if you want to send more data than
what you are willing to type or wish to explore the effect of the radio’s tuning
parameters on the data stream.
8. With the AW900R4 modules, you can interconnect multiple RS-485 busses. An
interesting configuration to consider uses the Access Point as a coordinator/
repeater with no serial devices connected to it at all:
AW900R4
AW900R4 AW900R4
RS-485
Device 4
AW900R4
RS-485
Device 1
RS-485
Device 2
RS-485
Device 3
RS-485
Device N
(up to 32)
RF Data
at 1000 Kbps
Access Point
Coordinator/Repeater
Up to 16
Subscriber Units
RS-485 Busses
at 115.2 Kbps