The GDW-11 485 is a GSM/GPRS modem designed for industrial applications that
can be used on 900 and 1800 MHz GSM networks. The modem requires a SIM
card to provide connection to a network service provider.
As well as a standard RS-232 port the GDW-111 485 has an RS-422/485 interface
allowing multidrop connections to many types of industrial equipment.
The modem contains an enhanced TCP/IP stack to allow GPRS (General Packet
Radio Service) connections to be made seamlessly and reliably ensuring maximum
availability of the GPRS connection. If the GPRS connection is broken the modem
can automatically re-establish the link.
Another enhanced feature in the modem includes the ability to make a CSD
connection or send an SMS message when the DTR signal is activated, allowing the
modem to be used in applications where the connected device has no intelligence
to initiate a call using AT commands.
If a PIN number is used by the network, this can be stored in the modem to
ensure the availability of the modem after a power failure. The modem can also
periodically re-register with the network, this is required as some networks will
deregister a SIM that has not moved or been active for a period of time.
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GSM 900/1800 MHz |
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Extended temperature range –25°C to +50°C (–13 to –122°F) |
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GPRS, class B, class 10 |
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DTR triggered -dialling and SMS |
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Up to 11 data bits |
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8 x LED indicators |
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Speed CSD up to 14.4 kbit/s, GPRS up to 85.6 kbit/s |
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Speed serial: 300 to 115.2 kbit/s |
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Galvanic isolation for power supply |
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TCP/IP Stack |
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RS-232 / RS-422 / RS-485 interface |
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