Comet Synertia RF - Response to a Write Command; Response to an Invalid Request; Table 27: Structure of a Response to an Invalid Request

User Manual Synertia® RF Generator 91
The information contained in this manual is subject to change by Comet Yxlon without prior notice.
10.1.5 Response to a write command
If the generator receives a valid write command (FC = 0x42), it answers with a response
which is identical to the request, in other words, it echoes the request. For this reason, the
data structure is also identical to the request and as described in “SHFT protocol request”
on page 88.
10.1.6 Response to an invalid request
If the generator is, for any reason, unable to interpret the received request, its response
will contain an exception function code and an exception code explaining why the request
could not be processed. The following table shows the structure of a response to an
invalid request.
Header
Byte Number
1
2
3
Name
Address
Exception Function Code
Exception Code
Description
0x0A (fixed)
Received function code with
the highest bit set to 1
Exception code number
Table 27: Structure of a response to an invalid request
• Header
The response of the generator to an invalid request does always consist of exactly
3 bytes. The first byte contains the address of the Synertia® RF generator and is a
fixed value of 0x0A.
The second byte contains the exception function code, which is the function code
received from the generator with the highest bit set to 1. For an invalid read
command, the exception function code is 0xC1 (0x41 + 0x80), for an invalid write
command it is 0xC2 (0x42 + 0x80).