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LMT2-433-5-12K5 Datasheet(PDF) 6 Page - Radiometrix Ltd |
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LMT2-433-5-12K5 Datasheet(HTML) 6 Page - Radiometrix Ltd |
6 / 11 page Radiometrix Ltd LMT2/LMR2 Data Sheet page 6 Serial interface commands 2400 baud RS232. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits. Serial data is sent to the unit on one of the parallel channel select pins (P0). It is very important that the unit does not 'decode' switch bounce in ordinary operation as a command string, or spurious re- writing of the e2prom will result. For this reason the user must send the 16 character string ENABLESERIALMODE (followed by a carriage return) to activate the serial command mode before sending any of the command strings listed below. Command mode is disabled on power down, or on reception of a # character. To successfully program the unit, it must be enabled ('RXE high (rx) or TXE low (tx)). GOCHAN aa Serially select channel aa, where aa is ch0 to ch31 LOAD aa nnnnn Set value of N register for channel aa, where aa is Channels 0 to 31 SETPAR Channel selected by 4 bit parallel inputs (ch0 to ch15 only) SETSER Channel selected by most recent GOCHAN operation RVALUE rrrr Set value for R register SINGLE nnnnn Set value of N for single channel operation. N value NOT stored in EEPROM <cr> Process entry / Clear all buffers # Disable command mode aa = a two digit channel number from 00 to 31 nnnnn = synthesizer N register value (up to 65535) rrrr = synthesizer R register value (up to 16383) 17356 25 900 . 433 = = = kHz MHz f f N cing Channelspa RF TX kHz MHz f f R cing channelspa TCXO 25 13 = = , So R=520 16500 25 4 . 21 900 . 433 4 . 21 = − = − = kHz MHz f MHz f N cing Channelspa RF RX Note: A pause of at least 50ms must be allowed between command strings (EEPROM programming time). SINGLE mode does not store the N value in EEPROM. Therefore the unit is inoperative after a power down until either another valid SINGLE command is received, or mode is changed by a GOCHAN, SETPAR or SETSER command. SINGLE mode is intended for frequency agile applications. |
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