Setup Of Two Trf6901 Rf Tool Kits In The System Mode - Texas Instruments TRF6901 User Manual

TRF6901 RF Tool Kit System Mode Overview
6.1 TRF6901 RF Tool Kit System Mode Overview
The TRF6901 RF tool kit features an application example for an RF link. This
mode is called the system mode. In this mode, the MSP430F149 populated
on the TRF6901 serial port module is driving the TRF6901 on the RF EVM.
With two TRF6901 RF tool kits a simple RF link can be established. This is
shown in Figure 6−1.
Figure 6−1. Setup of Two TRF6901 RF Tool Kits in the System Mode
To PC
Serial
Port
6.1.1 Protocol Used by the System Mode RF Link
Data Format RS232:
Data Bit Rate RF:
Data Format RF:
Data Coding (PCM):
Transmission Technique:
6.1.2 Specification Followed for the System Mode RF Link Example
The following specification is used to set up the RF link in the 868-MHz to
870-MHz European ISM band.
RF carrier frequency:
Modulation:
IF frequency:
6-2
32-bytes of data = 32 ASCII signs = 256 bits,
Each byte: 1-start bit, 8-data bits, 1-stop bit,
no parity
32 kbps
Training (learning) sequence, 1 ms,
consisting of 31.25-µs pulses, followed by
1-start bit, 93.75 µs and the data sequence,
consisting of 2 bytes checksum + 32 bytes of
data
Nonreturn-to-zero (NRZ)
Bidirectional, half-duplex
869.3 MHz (see Note)
2 FSK, deviation ±50 kHz
Deviation is fixed by hardware on the TRF6901
RF EVM.
10.7 MHz, 330-kHz bandwidth
To PC
Serial
Port