HYDROMEA LUMA 250LP User manual

LUMA 250LP
a fast, low-power, optical underwater communication system
6/2017

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Contents
1 Introduction............................................................................................................................. 2
2 Operation................................................................................................................................. 2
2.1 Setup ................................................................................................................................ 2
2.2 Operation ......................................................................................................................... 2
3 Maintenance............................................................................................................................ 3
4 Electrical and Software Characteristics ................................................................................... 4
5 Mechanical Characteristics...................................................................................................... 5
1Introduction
The LUMA 250 LP (low power) is an optical modem for fast, reliable underwater
communication. Each LUMA 250 LP is a full transceiver and thus capable of half-duplex
communication (transmission and reception). A deep-sleep mode which the modem will enter
after no data was received or transmitted for a set amount of time drastically reduces the
power consumption. During deep-sleep the receiver is still active and the modem will wake up
within 100ms after receiving a beacon message from another modem.
2Operation
2.1 Setup
Attach both modems to their respective host systems using matching female SubConn Micro 6
Micro 6 connectors such as MCIL6F, MCBH6F, MCOM6F, MCPBOF6F or MCDC6F. Please make
make sure to match the pinout provided in "0

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Electrical and Software Characteristics".
Apply a suitable supply voltage (12V –36V).
When properly aligned and within communication range, the two modem now provide
a half-duplex serial communication link.
2.2 Operation
When in active mode the modem will broadcast all data received over the cable and
send over the cable all data received from the optical receiver. When in sleep mode the
modem ignores all data coming in from the optical receiver and the cable. Only a
specific beacon message or power-cycling can wake up the modem.
Auto-sleep: When enabled, the modem will automatically enter sleep mode if no data
has been sent or received for a set period which can be configured.
Beacon transmission: When the beacon interval time is set to a non-zero value the
modem will regularly send a beacon message at the specified rate. Any modem in sleep
mode which is within range will be woken up by the beacon.
Thermal fold-back: The emitter of the modem consist of 12 high power LEDs composed
of one bank of 6 LEDs and two bank of 3 LEDs each. During normal operation all 12 LEDs
are transmitting in parallel to provide the highest possible transmission range. If the
circuit board temperature rises above 60°C the modem will dynamically switch off
emitter bank until the temperature returns to a safe level.
3Maintenance
Please wash the modem with warm water (only) to remove any built-up which could negatively
affect its operation. Apply a thin film of silicone grease to the rubber part of the connector pins
to protect the connector and to facilitate mating. For maintenance details regarding the
connector follow SeaConn's instructions.

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4Electrical and Software Characteristics
Supply voltage (Vs)
12 –36 V
Power consumption
< 10 mW (sleep mode)
0.5 W (active mode, receiving)
2 –5 W (active mode, transmitting)
Range
up to 7m (250 kbit/s)
3m (600 kbit/s)
Data rate (optical)
Software selectable:
250 kbit/s
600 kbit/s
Data rate (wire)
Software selectable:
2400, 4800, 9600, 19200, 38400, 57600, 115200, 512000
Transmission power
Software selectable:
1, 2, 3 or 4 banks with 3 LEDs each
Interface
Software selectable:
RS232
RS485
Beam pattern
120 degree cone
Connector pinout
1: Supply voltage (Vs)
2: GND
3: RS232 TX / RS485 D-
4: RS232 RX / RS485 D+
5: n/c
6: n/c
Encryption
Extra feature, available on demand
Error correction
Software selectable:
Forward error correction, overhead 2:1
Forward error correction, overhead 1,5:1
Auto sleep
Software selectable:
0 (= off), 1 –60000 seconds
Beacon signal interval
Software selectable:
0 (= off), 1 –120 seconds

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5Mechanical Characteristics
Length x Width x Height
100 x 50 x 30 mm
Weight in air
250 g
Weight in water
50 g
Connector
SubConn MCIL6M
Depth rating
6000 m

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