Version List

Transceiver module TRX433-10C2 / TRX868-10C2 (Vers. 1.0E) 38
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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
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