Micron Gemini
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RS485
This is the preferred serial communications protocol. It is recommended that the minimum
speed 921600 baud be used for best overall performance.
Autocomms
The Tritech USB adapter supports auto negotiation of baud rate and communications protocol.
When it starts it always defaults to RS485. If RS232 is required, then you will need to left
mouse click on the ID number of the Micron Gemini and select RS232 from the dropdown
within the General tab.
This will only be an issue on links that do not allow RS485 communication, i.e. a fibre optic
multiplexer
Serial Wiring
For wiring of the DE-9 connector please see “USB to Serial Adapter Cable Options”
Ethernet
The Ethernet adapter on the host PC must be in the same IP address range as the Gemini
being attached. Using network comms allows multiple Geminis to be integrated using standard
networking equipment.
Things to note:
The Micron Gemini works on 100BASE
−
TX link.
It is not recommended that you connect the Gemini units through a network hub. It is
recommended that Gemini sonar units are connected using a network switch.
Note
A network hub broadcast to all its ports and thus shares its bandwidth with
each of the ports. If multiple devices are connected then the bandwidth
allocation will be shared between devices, and so the bandwidth per device
will drop. This will negatively affect the performance of the network.
A network switch keeps records of the MAC addresses of the devices
connected so when a frame of data is received the data is sent to the
appropriate port rather than broadcast. This means that each port on a
network switch will have the maximum amount of bandwidth.
Check your antivirus situation. Firewalls will see the data from the Gemini and may
stop the broadcast message. Occasionally a firewall will allow the broadcast message
but will stop the high data rate from imaging believing it to be a denial-of-service attack.
