4.Applications

4.1.Peer to Peer

There are three types of peer to peer operational modes to choose from. The following table outlines the settings information and limitations.

Mode

Description:

 

In this mode, the SST-2450 can accept and transmit any signal from the

 

device. This mode works by using a sample and rebuild. The SST module

 

samples the input signal then converts it into a wave signal technique before

 

transmitting it to another SST module. When the other SST module receives

 

the wave signal, it transforms the signal back into the original format. The

1

sample rate used is 32kb per second, so the device can’t accept higher

 

speed signals. The maximum signal speed is less than 9600 bps. Any data

 

format may be need in this mode.

 

Setting Limitative: Baud Rate must be 9600bps or below; Full-duplex;

 

Asynchronous; One SST-2450 is the Master the other is the Slave.

 

 

 

This mode simulates the Full-duplex mode. The device can transmit and

 

receive signals at the same frequency. The RF processor uses the timer

 

controller to simulate Full-duplex. Initially, the module that has been set as

 

the master is in transmission mode. After 4ms, it switches to receive mode.

 

The slave module is inverse to thus. For example if the master is in

 

transmission mode but a signal need to be transmitted by the slave at the

2

same time; the slave will store the signal in it’s buffer and will transmit once

 

the master is in the receive mode. In Mode 2, the RF signal will be

 

processed by the 8051 CPU so requires the fixed data format to be either N,

 

8,1 or E, 8,1.

 

Setting Limitative: Full-duplex; Synchronous; One SST-2450 is the Master

 

and the other is the Slave.

 

 

 

This mode simulates the Half-duplex mode. One device will respond when it

 

receive a command from another device. This is the only mode which

3

supports a SST-2450 network (refer to page 13). This mode is also requires

a fixed data format to be either N, 8,1 or E, 8,1.

 

 

Setting Limitative: Half-duplex; Synchronous; Both SST-2450s are slaves.

 

 

 

Refer to chapter 5 for further setting argument information.

SST-2450 Wireless Modem User’s Manual Ver1.5, Feb /2003, OMH-030-10,---7

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ICP DAS USA SST-2450 user manual Applications, Peer to Peer