User's Guide

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each block is transmitted, the TX20K switches its transceiver to receive
configuration commands from the RX20K. If a command is received
before the next block needs to be sent, it is executed. If no command is
received, the next sample block is transmitted at the scheduled interval.
The TX20K always operates in this mode when it powers up.
Because samples are buffered at the transmitter in block mode, they are
delayed by between one and two block intervals before reaching the
USB port of the PC.
Table 4, Block mode baud/sample rates
Baud Rate
Sample Rate
Block Interval
250Kbps
5000sps
20msec
250Kbps
500sps
200msec
250Kbps
50sps
2 seconds
2.2.5.2 Stream Mode
In Steam Mode the transmitter streams torque measurements
individually and continuously at a rate of 5000 samples per second.
Samples reach the analog output with low latency. This is the highest
speed, lowest latency operating mode for the TT20K. This makes it very
useful for accurately synchronizing the torque signal to other events or
signals.
Since the TX20K is constantly transmitting torque samples, it does not
have enough time to switch its transceiver to receive commands from the
RX20K. Therefore, the operational mode of the TX20K cannot be
changed while it is in Stream Mode. However, the user can specify how
long the TX20K will be in Stream Mode. This time can be from 1 to 4095
minutes (2 days, 20 hours, 15 minutes) or indefinite, which is when the
battery dies or power is cycled. When Stream Mode time expires, the
TX20K reverts back to Block Mode operation at 250Kbaud/5000sps.
Cycling TX20K power takes it out of Stream Mode and back into Block
Mode operation.
In Stream mode, samples are also buffered and transmitted serially
through the USB connection in 100 sample blocks just like block mode.