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Transceiver module TRX433-10C2 / TRX868-10C2 (Vers. 1.0E) 38 _____________________________________________________________________________________ Functional name READ Data Format (from EEPROM) Function 02H Functional call 0B0H, 02H, 10H Answer 02H, FORMAT (Bit register) The individual bits of the FORMAT define the different possible settings in connection with the serial data transmission over RS232 and the radio data transmission. To see the exact effects on the timing behavior and the individual settings go to the paragraph radio transmission. FORMAT, bit0 = 0: CRC16 off. No checksum of the radio data. FORMAT, bit0 = 1: CRC16 on. Checksum of the radio data with CRC16 FORMAT, bit1 = 0: Handshake off. No Handshake of the RS232-interface FORMAT, bit1 = 1: Handshake on. Handshake of the RS232-interface with RTS/CTS FORMAT, bit2 = 0: Fast send off. Start of the radio transmittion after 2-3-byte-pause over RS232 FORMAT, bit2 = 1: Fast send on. Start of the radio transmittion right after the first byte over RS232 FORMAT, bit3 = 0: After data out, the RSSI of the radio telegram is not output FORMAT, bit3 = 1: After data out, the RSSI of the radio telegram will be output FORMAT, bit4 = 0: After the RSSI of the radio telegram, the no signal condition– RSSI will not be output FORMAT, bit4 = 1: After the RSSI of the radio telegram, the no signal condition– RSSI will be output The CRC16 – checksum is a 16-bit checksum which helps to protect the radio transmittion. If the checksum calculated by the receiver isn’t the same as the checksum transmitted from the radio module then the data will be rejected. When the Handshake is enabled then you shouldn’t send any data over the RS232 to the transceiver module as long as the RTS-pin is set to high. The user can stop the output of data through the transceiver with setting the CTS-pin on high. When the handshake is disabled then the user himself is responsible that the internal transmittion buffer and receive buffer of the transceiver module won’t overfill. RTS- and CTS-line are ignored in this case. Fast send can just be used up to a RF data rate of 19.2kbit/s (respectively 9.6kbits/s by 8MHz µP clock frequency) because an enabled fast send means more computing effort for the transceiver. The no signal condition – RSSI can just be output when the RSSI of the radio telegram is output as well. The RSSI of the telegram and the no signal condition – RSSI are output in a two’s complement in dBm in addition to the over radio transmitted payload. Note: • The current configuration (RAM) can differ from the configuration in EEPROM! • When the CTS-pin is used as a handshake then you shouldn’t send any further data to the transceiver module as long as the CTS-pin is set on high because those data would be interpreted from the transceiver module as configurations data _____________________________________________________________________________________
Transceiver module TRX433-10C2 / TRX868-10C2 (Vers. 1.0E) 39 _____________________________________________________________________________________ Functional name READ EEPROM Function 03H Functional call 0B0H, 03H, EE_ADR Answer 03H, EE_REG EE_REG: EEPROM register contents to the address EE_ADR EE_ADR = 0 … FFH Read any EEPROM register byte. The part of the EEPROM that the transceiver doesn’t use (address 0D0H…0FEH) can be used free from the application. The calibration values of the transceiver, diverse constants like the configuration are stated in this EEPROM as well and are accessible to the application. The writing protection EE_WRPROT for the EEPROM is in the EEPROM-address FFH. Every one of the 8 bits of the EEWRPROT controls an EEPROM part as follows: Bitn = 0: Address range is writable and readable (factory setting) Bitn = 1: Address range is not writable and only readable EE_WRPROT, Bit0 address 00H...1FH calibration values frequency and RSSI EE_WRPROT, Bit1 address 20H...6FH calibration values temperature compensation EE_WRPROT, Bit2 address 70H...8FH calibration values reserve EE_WRPROT, Bit3 address 90H...9FH Hardware constant EE_WRPROT, Bit4 address A0H...AFH Software constant EE_WRPROT, Bit5 address B0H...CFH current transceiver configurations EE_WRPROT, Bit6 address D0H...FEH free usable for applications EE_WRPROT, Bit7 address FFH...FFH EE_WRPROT (this byte) The write protection EE_WRPROT only applies for the access with the commands WRITE EEPROM and not for the other WRITE commands which also write in the EEPROM. Note: • Even if the whole EEPROM is free to write in, only the to the application assigned block can be used (address 0D0H…0FEH) • When the application uses the EEPROM as memory then set EE_WRPROT on b’10111111’ = BFH to protect the EEPROM from unwanted changes. • After bit7 of EE_WRPROT in EEPROM is set on 1 then the writing protection as a whole can’t be changed anymore. Therefore this command has to be used deliberately! • When other EEPROM-data e.g. the calibration values were changed then the transceiver might be unusable and has to be recalibrated from the producer. See EEPROM function 2DH, 2EH, 2FH for writing on any EEPROM registers. _____________________________________________________________________________________
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