Installation
Micron Echosounder
0650-SOM-00001, Issue: 02
12
© Tritech International Ltd.
Caution
Never attempt to operate the Micron Echosounder at the end of a long cable by
increasing the PSU output voltage above the maximum rated voltage of the unit.
3.3. Communications
Caution
The power should be turned off before making a connection between the sonar
head and surface controller (SCU or SeaHub).
3.3.1. Port Layout
Note
For pin-out diagrams and cable specification refer to Chapter 1,
.
The Micron Echosounder is supplied with two communications ports labelled
MAIN
and
AUX
.
All serial communication to the control computer on the surface or to another micron device
should be via the
MAIN
port.
The
AUX
port of the micron sonar is used only for analogue voltage output. If only analogue
voltage is required then the
MAIN
port can be left blanked off and the power supplied via
the
AUX
port.
The communication configuration of the ports are factory set (although they can be changed
in software) . 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 on the main and aux port are possible.
Note
If the settings are changed through software it is important to keep a record
of the changes, otherwise it can become very difficult to re-connect to the
Echosounder.
3.3.2. RS232 Characteristics
The RS232 telemetry is bi-directional, 3-wire (TX, RX and ground) with a maximum speed
of 115.2kbps.
This may form the connection between the Echosounder and the control computer RS232
COM port. Typically this is a DE-9 port or via a DE-9 to USB converter if the computer has no
native RS232 ports (such as in modern laptops). It is also possible to connect via an RS232
modem or multiplexer.
Maximum cable length
Depending on the type of conductors used, the RS232 may only drive up to 20m
of copper cable. For longer cable lengths it is necessary to run through a repeater
or converter, or switch to optical fibre with an RS232 telemetry option.
