Tranceiver adjustment
Posted: Tue Jul 03, 2012 8:30 am
Hello,
I have been experimenting with tranceivers and more specifically the following:
HM-TR433/TTL from Hope Rf electronics.
2 years ago when I was doing the experiments- communicating between 1 tranceiver with another- I managed to establish a communication for a few days but after something went wrong. 2 years later I do not remember what I did and my proto test board is damaged.
Now I built up 2 new board and try to communicate again but with no luck.
Long story short, the tranceivers communicate with RS232 method of the MCU. I connect the Rx and Tx pin of MCU to the Tx and Rx pin of tranceiver respectively.
1. On the set up utility for the tranceiver are some options that need to be set up. I want to ask if any of them has to do, or to be changed via flowcode in order to match up.
I have selected the same baud rate, 8 bit, no check and 1 bit stop. However there are some other options as well. The "RF parameter" which options span from +-15kHz up to +-240kHz. The "PA level" from 0dBm to -21dBm and "RX bandwidth" from 67-400kHz. Do I have to change these values to specific ones in order for the tranceiver to communicate with the MCU?
2. Also I have noticed that in Flowcode at the RS232 properties, there is a window that says if I use 20Mhz crystal it will have a small percentage of error but if I use the 19.6Mhx crystal then it will have a zero error. So if I use the 20Mhz most likely it will not be able to communicate with tranceiver?
3. Do I have to amplify the signal coming from the Rx and Tx pins of MCU?
4. Some manufacturers say that must a decoder must be interpolated between the MCU and tranceiver, so that the data be sorted in packets. (manchester coding)
Thank you in advance,
Best Regards,
Andreas Achilleos
I have been experimenting with tranceivers and more specifically the following:
HM-TR433/TTL from Hope Rf electronics.
2 years ago when I was doing the experiments- communicating between 1 tranceiver with another- I managed to establish a communication for a few days but after something went wrong. 2 years later I do not remember what I did and my proto test board is damaged.
Now I built up 2 new board and try to communicate again but with no luck.
Long story short, the tranceivers communicate with RS232 method of the MCU. I connect the Rx and Tx pin of MCU to the Tx and Rx pin of tranceiver respectively.
1. On the set up utility for the tranceiver are some options that need to be set up. I want to ask if any of them has to do, or to be changed via flowcode in order to match up.
I have selected the same baud rate, 8 bit, no check and 1 bit stop. However there are some other options as well. The "RF parameter" which options span from +-15kHz up to +-240kHz. The "PA level" from 0dBm to -21dBm and "RX bandwidth" from 67-400kHz. Do I have to change these values to specific ones in order for the tranceiver to communicate with the MCU?
2. Also I have noticed that in Flowcode at the RS232 properties, there is a window that says if I use 20Mhz crystal it will have a small percentage of error but if I use the 19.6Mhx crystal then it will have a zero error. So if I use the 20Mhz most likely it will not be able to communicate with tranceiver?
3. Do I have to amplify the signal coming from the Rx and Tx pins of MCU?
4. Some manufacturers say that must a decoder must be interpolated between the MCU and tranceiver, so that the data be sorted in packets. (manchester coding)
Thank you in advance,
Best Regards,
Andreas Achilleos