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DC Powered Bell 202 / 202T and V.23 ModemsApplied Systems Engineering SM series products are Bell 202 /202T and V.23 modems designed for operation over leased line communication circuits as commonly used in the electrical power and pipeline SCADA industries.
These modems have been designed with many commonly requested features including 900Hz soft-carrier turnoff, LED indicators, digital control over most timing parameters (in 1 millisecond increments), transmit levels from 0 to -31db, and input power from 5 to 160 VDC. The primary modem circuitry is based on commercially available ICs with many years of field proven operation. All Bell modems are available in a 19" rack configuration with a 16-slot custom backplane, or packaged in a metal box. For IED/RTU manufacturers, a low-cost "board only" version can mount directly in the Remote unit.
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Testing your Bell 202 ModemYour Bell 202 modem comes fully tested from the factory. However if you need to perform some tests on an installed modem, please follwo the steps below to verify modems operation: The loopback switch allows you to disconnect the analog output signals from the telephone line, and loopback the transmit and receive signal though a 10 dB pad. The 10 dB pad simulates a telephone line, and ensures the transmit signal does not override the receive signal. You can then transmit RS232 data on the transmit pin of the DB25 connector (pin-2), and the same RS232 data is received on pin-3 of the DB25 The loopback switch is located on the front panel of the Bell 202 modem enclosure. The following steps describe the test procedure for the single-channel modem:
This simple test verifies both the sending ad receiving portion of the Bell 202 modem. For more information about the products and services Applied Systems Engineering provides, select from the main menu on the top or please feel free to contact us directly if you have any questions or would like to discuss your requirements with an application engineer. You may contact us in Campbell, CA by phone at 408-364-0500, fax to 408-364-0550, or via email at products@ase-systems.com. Normal business hours are 9:00AM to 6:00PM Pacific Time, M - F. Products | Support | Downloads | Training | FAQs | About Us Applied Systems Engineering, Inc. Copyright ©2003-2007 Applied Systems Engineering, Inc. |
If you would like additional information on any of the ASE products or would like to discuss your specific requirements with a sales engineer, you can call directly or fax/e-mail the information about your requirement and a sales engineer will contact you. |