User Manual Synertia® RF Generator 97
The information contained in this manual is subject to change by Comet Yxlon without prior notice.
10.2 Host Port communication via RS-232
The communication protocol between host and generator via RS-232 is based on the
Modbus/RTU standard. The exchanged data packets consist of the requests and
responses described for the SHFT protocol above plus a CRC16 checksum.
10.2.1 Default communication parameters
For host port communication via RS-232, generators use the following default
communication parameters. If necessary, these parameters can be changed to match the
settings of the host.
• Bitrate: 115200 bits/s
• Data bits: 8
• Stop bits: 1
• Parity: Even
10.2.2 Data exchange via RS-232
Request via RS-232
The host initializes a data transaction by sending a request to the generator. The
generator recognizes a data packet as entirely received when it detects a pause with a
length of at least 1.5 times the time of a sign
1
after receiving the last data.
The generator interprets the request and sends its response within 50 ms or less. If the
host does not receive a response from the generator within 50 ms after sending the
request, it should consider the data transaction as unsuccessful and repeat the request.
The generator does not buffer the received data in a cue. This requires the host to wait for
the response from the generator or for the 50 ms timeout before sending the next
request.
The data packet sent from the host to the generator consists of the request as described
in “SHFT protocol – Request” on page 88 plus two additional bytes containing a CRC16
checksum which is calculated over all bytes of the request.
1
Example: This is only valid for baud rates up to 19200 bits/s. Above this, a fixed detection pause time of
1750 µs is used.
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