wireless transceiver 27997
john the evangelist
Posts: 2
hello,
I just bought 2 transceivers (27997.) I use it for my Atmel STK500 board. when I connect the straight RXD and TXD from the STK500, it works. then, I connect RXD and TXD of the STK500 to the corresponding RXD and TXD on one of the 27997. then on the other 27997, I connect the RXD and TXD to my data receiver. it did not work. I did provide GND and +5V connections to both of of the 27997. I did set the Baud rate to 1200 then 2400. still do not work.
I looked for the manual of the 27997 but Parallax changed the site so it was removed. do I have to program anything on the 27997 to make them work? or are the two 27997 broken and I have to contact Parallax to get them fixed or replaced? how can I test if they are working or not? please help. thank you.
I just bought 2 transceivers (27997.) I use it for my Atmel STK500 board. when I connect the straight RXD and TXD from the STK500, it works. then, I connect RXD and TXD of the STK500 to the corresponding RXD and TXD on one of the 27997. then on the other 27997, I connect the RXD and TXD to my data receiver. it did not work. I did provide GND and +5V connections to both of of the 27997. I did set the Baud rate to 1200 then 2400. still do not work.
I looked for the manual of the 27997 but Parallax changed the site so it was removed. do I have to program anything on the 27997 to make them work? or are the two 27997 broken and I have to contact Parallax to get them fixed or replaced? how can I test if they are working or not? please help. thank you.
Comments
The STK500 board actually has some problems with naming its pins. this is what I discovered for my project:
STK500-501 with Atmega128 WIRELESS CAUTION
Note: PE0 and PE1 mentioned below are not from the PORTE output pins (PE0 to PE7 on the STK501 expansion board), but the pins that are in the same place with PE2, RST, REF, GND, XT1, XT2, GND and VTG.·
Normally: on the same board, PE1 connects to TXD; PE0 connects to RXD. this is the way to receive output from the RS232 of the STK500 board.·
Wireless transmission method
Transmitting Station:
To transmit
PE1 of transmitting board connects to TXD on wireless module·
Receiving Station:
To receive:
··········· RXD of wireless module connects to TXD on receiving board·
Conclusion:
PE1 is outputting channel from the chip.
It connects to TXD on the same board, which is the receiving channel of the RS232 output of that board.·
PE0 connects to RXD (same board)
It is the receiving channel of the chip, and the transmitting channel of the RS232.
Dave
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Dave Andreae
Parallax Tech Support
Post Edited (Dave Andreae (Parallax)) : 11/29/2007 6:29:30 PM GMT