Version List

Transceiver module TRX433-10C2 / TRX868-10C2 (Vers. 1.0E) 4
Family overview radio transceiver
The radio transceivers of the family TRX433 and TRX868 are offered in several designs. Their difference is
in the software and / or in hardware.
At the moment, there are three versions A, B and C, which have the following differences:
Version A Version B Version C
Data interface RS232 any, transparent RS232
Configuration over
RS232
Sleep, Wake up
tasks
Only the most important
parameter, only possible
by power up
delay TX-RX 1 t DATA + tRADIO ,
see timing diagram
Comprehensive command
set, configurable during
operation at any time
No Yes Yes
6 t BIT-RADIO
Jitter +- 1/8 t BIT-RADIO
Comprehensive command
set, configurable during
operation at any time
t DATA + tRADIO
see timing diagram
Error checking CRC16 None With / without CRC16
Retransmit after
failure
Until the data are
acknowledged correctly
by the receiver
No No
Buffer size TX 2 x 31 bytes Ring buffer, 61 bytes 2
Buffer size RX 1 x 31 bytes, ring buffer Ring buffer, 61 bytes 2
Data handshake RTS-CTS, XON-XOFF RTS-CTS
The three versions cover the demands of different usage as follows:
Version A is for simple usage instead of cable e.g. between computer and peripheral device where the dead
time through the transmission path does not matter. Data are checked by the transceiver with regard to
faults. If faults are detected, data are repeated until correct reception. This version only sends the data when
the buffer is full or when no further data is on hold during the time of 3ms. Version A and Evalkit3 are ideal
for testing the radio range.
Version B is used when the maximal control over the radio channel is necessary or desired. There is
absolutely no coding or error checking done. The signal which is placed on the transmittion side is released
transparently with a minimal delay 1:1 by the receiver. The signal has therefore an optimal compatibility to
any way of coding and radio modules of other producers.
Version C with a transparent byte mode is used when a short reaction time and at the same time the
simplest activation is desired. The byte-by-byte incoming data are sent over radio with a short delay so that
the receiver can start with the serial data output just a few milliseconds after the transmission of the 1 st data
byte.
When the error checking is active, the receiver outputs only correctly transmitted data. Without the error
checking there, the higher-rated application has to take care of that.
1 tBIT_RADIO : time period for 1 bit with the chosen RF data rate
2 When the RF data rate is adjusted high enough in proportion to the RS232 baud rate then there occurs a
continued data flow without a break through the handshake