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SPM2-433-18-3V Datasheet(PDF) 4 Page - Radiometrix Ltd |
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SPM2-433-18-3V Datasheet(HTML) 4 Page - Radiometrix Ltd |
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4 / 15 page  Radiometrix Ltd, SpacePort Modem page 4 1. FUNCTIONAL DESCRIPTION The SPM is a connection oriented modem module for sending and receiving serial data via an RF communications link. The SPM handles all necessary protocol related functions of validation and retries to ensure error free and uninterrupted data is sent over the communications link. All data transfers between a pair of SPMS are fully acknowledged, thus preventing the loss of data. Bit coding and checksums are used on the data packets to ensure the validity of the received data at the remote end. 1.1 OPERATING STATES The SPACEPORT Modem has three normal operating states: • SHUTDOWN • STANDBY • CONNECTED SHUTDOWN The SHUTDOWN state is entered by asserting the WAKE/DTR input pin high (Vcc). It effectively forces the SPM into a suspended state. Communications cannot be made with the SPM in this state. STANDBY Immediately after power up and during normal operation, the SPM will automatically enter standby mode where it is waiting for a connection request from a remote SPM module. While in this mode a remote connection request can be received which will place the SPM into a connected state allowing it to then start receiving data from the remote unit. The connected host device can also send data to the SPM via the serial interface which will force the module to send a connection request to the remote SPM module, thus effectively setting up a logical connection between two units and allowing data to be transferred. CONNECTED On receipt of a connection request from a remote unit, the SPM immediately enters a connected state. This effectively allows the SPM modems to start sending and receiving data. In-coming data is sent to the host via the serial port in the same form as it was given to the remote SPM module. |
Similar Part No. - SPM2-433-18-3V |
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Similar Description - SPM2-433-18-3V |
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