ICP DAS IT450000 Users Manual

SST-2450 Wireless Modem User’s Manual

Warranty

All products manufactured by ICP DAS are warranted against defective materials for a period of one year from the date of delivery to the original purchaser.

Warning

ICP DAS assumes no liability for damages consequent to the use of this product. ICP DAS reserves the right to change this manual at any time without notice. The information furnished by ICP DAS is believed to be accurate and reliable. However, no responsibility is assumed by ICP DAS for its use, or for any infringements of patents or other rights of third parties resulting from its use.

Trademark The names used for identification only may be registered

trademarks of their respective companies.

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Table of Contents

1. Introduction...........................................................................................................3

2. Specifications........................................................................................................4

3. Product Description...............................................................................................5

3.1. Pin assignment ........................................................................................5

3.2. Block diagram..........................................................................................6

4. Applications..........................................................................................................7

4.1. Peer to Peer............................................................................................ 7

4.1.1. PC to PC connections -- Using Mode 1....................................... 8

4.1.2. Connecting a PC to the 7000 module – Using Mode 2.................9

4.1.3. 7188 Embedded Controller to 7000 module – Using Mode 3...... 10

4.1.4. Connecting a PC to a PLC – Using Mode 3................................11

4.1.5. Using the 7188 as a Bridge -- Using Mode 3..............................12

4.2. Network communication.........................................................................13

4.2.1. Application 1...........................................................................13

4.2.2. Application 2...........................................................................14

5. Quick Start instructions for the SST-2450...............................................................15

5.1. Installing the software............................................................................15

5.2. SST-2450 Setting ..................................................................................17

5.3. Testing the SST-2450............................................................................. 19

6. Troubleshooting...................................................................................................20

7. Dimensions......................................................................................................... 21

8. Din-rail Mounting................................................................................................. 22

9. Appendix............................................................................................................. 23

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1. Introduction

SST-2450EXT is a spread spectrum radio modem with controlling an RS-232/RS-485 interface port. It is designed for data acquisition and control applications between a host and remote sensors. It is also useful for those applications where the installation of cable wire is inconvenient. The SST-2450 can be used not only in peer-to-peer mode (refer to page 8), but also in a multi-point structure (refer to page 13).

The SST-2450 is based on a direct sequence spread spectrum and RF technology, operating In the ISM bands with a Frequency Range of

2410.496MHz~2471.936MHz. The Channel Spacing is 4.096MHz.

The SST-2450 is similar to the SST-2400, with the major difference being the setting control method. The SST-2400 is set using jumpers, whereas the SST-2450 is set using a software utility. The older SST-2400 can work in conjunction with the new SST-2450 by changing its internal 8051 chip. The new chip includes updated firmware, so please contact us and we will send a new chip. Refer to page 26 for detail.

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3. Product Description

3.1. Pin assignment

SST-2450

Radio Modem Frequency Range : 2410~2471MHz Channel Space : 4,096 Mhz Communication Range : 100-300M Interface :RS-232/RS-485

SET

GND

(RS-232) (RS-485)

GND

(Y)DATA+

(G)DATA-

(R)+Vs

(B)GND

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3.2. Block diagram

Transceiver

The SST-2450 wave signal cannot pass through metallic obstacles. So this product is not suitable for this type of metallic environment.

The signal can pass thorough a cement wall, but will be weakened to half its efficiency for every 15cm of the wall’s thickness.

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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 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

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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.

Refer to chapter 5 for further setting argument information.

4.1.1. PC to PC connections -- Using Mode 1

Full-Duplex Asynchronous Master Baudrate: 9600bps Max.

Full-Duplex Asynchronous Slave Baudrate: 9600bps Max.

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