If you are trying to setup multiple SR5500 sync system, and after all the correct configurations, and you still encounter the sync issue as below error information
SR5500ChannelEmulator.Connect Exception: The test pattern sent on unit 1 and read back from unit 2 did not match. Pattern sent = '0x01 '. Pattern received = '0x787A'. Bit mask = '0x67'.
This is caused by the wrong FPGA locations on the fader,
the primary FPGA card should be inserted on the primary location on the fader chassis for the primary unit.
Secondary FPGA card should be inserted on the secondary location on the fader chassis for the secondary unit.
You may not have the ability to change, please contact your local support team and sales to do this change.