ICP DAS USA Modem SST-2450 Benutzerhandbuch

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There are three types of peer to peer operational modes to choose from. The 

following table outlines the settings information and limitations. 

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 
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 
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 
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.