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MiriAD 2000 Modules |
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Radio Modems |
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Applications |
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MiriAD2000 Module Communication Options
There are many communications interfaces available to connect the MiriAD2000 onto the network of your choice. An assessment of the various wireless options available to match them to your application, download the following discussion paper AD2000 Data Sheet - Assessment of Different Wireless Systems Available.
Download a full AD2000 Series product overview brochure here.
The various communications options are summarised below:
External Narrow Band Radio Modem
External Spread Spectrum Radio Modem
PCMCIA port to serial and Ethernet connections
The most popular is to use the internal data radio option (part number AD2000I-XX-XX) allowing the creation of dedicated data radio networks and utilising the on-board FFSK modem. This is a suitable for low to mediium data volume systems and where no other communications infrastructure exists.
For 2400 baud operation a 12.5kHz channel allocation is required.
For 4800 baud operation a 25kHz channel allocation is required.
450 - 460MHz band
471MHz band
800 - 900MHz band
Modulation is FFSK 2400 or 4800 baud.
Others frequency bands available on request as per the table below.
At the time of ordering please ensure that the correct internal radio type and frequency is specified to ensure the correct delivery of your required frequency band.
4 wire FFSK interface 2400 or 4800 baud
or RS232 interface to 38.4 kb
The INT/EXT port on the MiriAD2000 unit has an on-board FFSK modem which is suitable for connection to external radios.
When using an external audio modulated radio, it is preferred if possible to retain the preset levels of modulation within the AD2000 and to adjust the levels in the external radio to match these preset levels. The preset audio output level from pin 3 is 600mv peak to peak. This is adjusted in the AD2000 using VR201 if necessary. The received data audio level into the AD2000 should be 500mv peak to peak. The received audio level to the modem is monitored at test point “Rx.SIG.IN” and is adjusted using VR202 if necessary.
For further detail see the section on External Radio Port in the AD2000 Installation & Wiring Manual.
External Narrow Band Radio Modem
Miri offers a range of external radio modems that provide 9600bps data rates. These are suitable for systems with large amounts of data transfer of for radio backbone installations for MiriAD2000 systems that utilise the internal radios.
Further details are available by following the following links:
450MHz 9600bps data radio modem
900MHz 9600bps data radio modem
External Spread Spectrum Radio Modem
There are several popular brands of spread spectrum radio modems on the market. The MiriAD2000 units readily interface to these and Miri can provide working solutions should you require further advice.
The MiriAD2000 units have an in-built RS232 interface that supports baud rates to 38.4kb which can be used to connect to external devices via any supported protocol. Typically this would be PLCs, DCSs, HMI packages and PCs running a variety of software communications and prgramming packages (including the MiriMap2000+ software package). The port can also be used for connection to external radio modems that supprt RS232 interface and full RTS control of PTT is supported.
The RS232 can also be used to connect to external PSTN (Public Switched Telephone Network) i.e. dial-up modems (and PCMCIA modems can also be used via the MiriAD2000 PCMCIA port detailed below).
The RS232 can also be used to connect to external GSM and CDMA modems. With this feature the SMS features of the MiriAD2000 unit can be used.
PCMCIA port to serial and Ethernet connections
The in-built PCMCIA port n the MiriAD2000 unit currently supports:
Additional Serial Interface card
Ideal for the AD2000 model for an extra RS232 port.
Ethernet (support for TCP and UDP for slave mode protocols (e.g. for connection to HMI/DCS packages) Miri2000, Modbus and Allen Bradley DF1. For the Modbus and Allen Bradley DF1 protocols a second concurrent socket running the Miri2000 protocol is possible allowing simultaneous monitoring and programming via the MiriMap2000+ software package.
A range of GSM modems have been tested and used to provide remote connectivity to AD2000s using the extensive GSM network available worldwide. With this feature the SMS features of the MiriAD2000 unit can also be used. The AD2000 Series units can also be installed with an internal GPRS modem for use on GPRS systems.
Download a GSM/GPRS datasheet for further details.
Download a project application data sheet AD2000 Application Data Sheet - GPRS Based Flood and River Management System - Thailand showing the GPRS system capabilities.
An external CDMA modem has been tested and used to provide remote connectivity to AD2000s using the extensive CDMA network available in many remote regions throughout the world. With this feature the SMS features of the MiriAD2000 unit can also be used.
A range of external PSTN (Public Switched telephone Network) modems and PCMCIA modems have been tested and used to provide remote connectivity to AD2000s using the extensive copper wire based telephne network available throughout the world. With some telecom system providers this feature the SMS features of the MiriAD2000 unit can also be used.