Installation Micron Modem
0630-SOM-00001, Issue: 01 10 © Tritech International Ltd.
3.3. Power
The Micron Data Modem should be powered from a clean DC supply or battery pack.
To reduce damage to the device in the event of over-voltage it is recommended that
an appropriate fuse is included in the power supply connection.
For full details of the power requirement refer to Chapter 2, Specification.
3.4. Communication Protocol
The Micron Data Modem is supplied with two communications ports labelled MAIN
and AUX (short for auxiliary). All communication to the control computer on the
surface should be via the MAIN port.
The communication protocols used by the ports are factory set and are not user
selectable other than at the time of build.
• The RS232 telemetry is bi-directional, 3-wire (TX, RX and ground) between the
data modem and the controlling serial port.
• The RS485 telemetry is half-duplex, 2-wire (RS485+ and RS485-). Typically the
controlling RS485 connection can be an RS485 serial port installed in a computer
or can be an RS485 to RS232/USB signal converter. The RS485 circuit inside the
Micron Modem is factory supplied with a 150Ω termination.
A pair of Micron Data Modems can be connected between two serial devices in order
to transfer data between them acoustically.
For pin-out and cable specification refer to Chapter 2, Specification
3.5. Port Layout
The Micron Modem is supplied with two communications ports labelled MAIN and
AUX. All communication to the control computer on the surface should be via the
MAIN port, while the AUX port is used for daisy chained communication links to other
Tritech International Ltd sensors, such as the Micron Echosounder.
The communication configuration of the ports are factory set. The factory setting is
written on the label attached to the Micron, and can also be obtained from the original
build record.
Any combination of protocols (RS232 and RS485 only) are possible and Tritech
International Ltd use the letters A to D to denote the factory settings:
