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Transceiver module TRX433-10C2 / TRX868-10C2 (Vers. 1.0E) 42 _____________________________________________________________________________________ Functional name WRITE RS232 baud rate Function 0CH Functional call 0B0H, 0CH, BAUD Answer 0CH, BAUD BAUD = 00H: 1.2 kBaud, tolerance+- 1% BAUD = 01H: 2.4 kBaud, tolerance+- 1% BAUD = 02H: 4.8 kBaud, tolerance +- 1% BAUD = 03H: 9.6 kBaud, tolerance +- 1% BAUD = 04H: 19.2 kBaud, tolerance +- 1% BAUD = 05H: 38.4 kBaud, tolerance +- 1% BAUD = 06H: 57.6 kBaud, tolerance +- 1% with 16 MHz clock 57.6 kBaud, tolerance -3.5% +-1% with 8 MHz clock BAUD = 07H: 115.2 kBaud, tolerance -3.5% +-1% The highest baud rate of 115.2kbaud is just possible with a 16MHz µP clock frequency. The baud rates have the stated typ. tolerance of the ideal value. The at a time highest adjustable baud rate is 3.5% lower than the nominal value, i.e. 111.1kBaud respectively 55.5kBaud (by 8MHz µP clock frequency). The sum of the tolerance of both communication partners should be smaller than 6% (standard) to avoid communication problems. Note configuration-baud rate The adjusted RS232 baud rate just applies for the normal data traffic but not during the configuration (MODE-Pin on high). An automatic detection of baud rate is implemented in the configuration mode which automaticly detects all of the baud rates above (there is a 16MHz µP clock frequency required for 115.2kBaud). That means it can be configured with any baud rate. Automatic output like the READY after a power up are just output when the module is in the configuration mode (MODE-Pin on high). The automatic outputs are output in the baud rate which was the last one used to configure. These automatic outputs are suppressed in a normal operating mode (MODE-Pin on low). When Bit7 of Byte2 is high then the parameter is stored in EEPROM as well and the configuration is activated right after the start up. The answer is always Bit7 = 0. _____________________________________________________________________________________
Transceiver module TRX433-10C2 / TRX868-10C2 (Vers. 1.0E) 43 _____________________________________________________________________________________ Functional name WRITE power up mode Function 0DH Functional call 0B0H, 0DH, PWUP_mode Answer 0DH, PWUP_mode (Bit register) The individual bits of the PWUP_mode define the behavior of the transceiver after a power up. The command is e.g. important for a battery operation or with switched supply so that the transceiver doesn’t use battery current after a change of battery and doesn’t have to be configured by an external controller. The configuration of PWUP_mode just effects when bit2 = 0. Otherwise the transceiver starts normally by a power up. Therefore, bit2 is the “main switch”. This command is alike the sleep-command. The difference is that it only effects by Power up as well as by an automatic sleep right after a power up. Bit0 and bit1 just effect for a wakeup out of an automatic sleep after a power up (therefore not by a normal wakeup after a sleep-command). By a continue after a wakeup, the transceiver is ready again pretty fast (by 19.2kbit/s RF data rate after 3ms, by 2.4kbits/s RF data rate after 5ms) after a wakeup and doesn’t make a calibration and configuration, compared to the soft-reset, which normally takes about 75ms. PWUP_mode, bit0 = 0: Wakeup makes an internal soft-reset, i.e. the program will be restarted PWUP_mode, bit0 = 1: Continue after wakeup, i.e. program continues where it was before the sleep PWUP_mode, bit1: unused, reserved for wakeup PWUP_mode, bit2 = 0: automatic sleep after power up. Transceiver has to be awakened afterwards. PWUP_mode, bit2 = 1: Runs after power up i.e. transceiver starts after power up with config. from EEPROM PWUP_mode, bit3: unused, reserved for power up PWUP_mode, bit4: unused, reserved for sleep-state PWUP_mode, bit5 = 0: set all pins except WKUP-pin during sleep on output with low-level PWUP_mode, bit5 = 1: all pins stay unchanged The automatic sleep after the power up can be stopped with the WKUP-Pin. For that a change in level has to appear at the WKUP-Pin. The transceiver respnds after the wake up with the READY-signal 30H, 01H “ready after wake up” and the pins CTS and RxD become inputs if they were set on output during the sleep (the READY-signal will only be output if the transceiver is in the configuration mode). Alternatively, the RTS-pin can be supervised. After a power up with an automatic sleep the RTS-Pin changes to high after ca. 110ms (sleep will be started). When the transceiver is awakened (with slope change on the WKUP-pin) then the RTS-pin will be reset to low. You can also use a negative slope on the RTS-pin as ready signal. Note: only the configuration in the EEPROM is of interest, the value in the RAM will be lost by a power down – power up cycle! Therefore Bit7 of Byte2 has to be high and the parameter has to be stored in EEPROM so that the configuration will be activated after a power up. The answer is always with Bit7 = 0. See paragraph energy saving mode and WRITE sleep. ___________________________________________________________________________
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