User Manual

Quatech QTM-8524 Manual 39
4.4.3 Mode 3: Full Duplex, Asynchronous
Using Mode 3, QTM-8524 modules can be used to transmit data in any
format. In Mode 3, only point-to-point communication is permitted. Both
QTM-8524 modules must be configured for full-duplex mode and RS-232
communication, and must share the same frequency. In this mode channel
selection is ignored and baud rate need not be synchronized. However,
baud rate must be kept under 14.4 kbps. This is because data waveforms
may be distorted using data ratesgreater than 14.4 kbps. The controlling
appliation must handle all desired synchronizing and error correction duties.
Jumper Configuration:
1. No Channel Selection
2. Select Frequency from 2426.112 - 2458.26 MHz (Jumper 2)
3. No baud rate selection
4. Select Full Duplex Mode (Jumper 4)
5. Set one QTM-8524 to Master and one to Slave (Jumper 5)
6. Select Asynchronous Communication (Jumper 6)
7. Select RS-232 (Jumper 7)
(See Figure 2.5 for a diagram of QTM-8524 jumper settings.)
Advantages:
1. Full duplex communication
2. Variable data formats
Limitations:
1. Peer-to-peer communication
2. Maximum Baud Rate: 14.4 kbps
3. RS-232 Communication only
4. Cannot be used with QTM-8000 Series I/O Modules