4/2021
LUMA 100
3
1
Introduction
The LUMA 100 is an optical modem for fast, reliable underwater communication. Each LUMA
100 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 100 ms after receiving a
beacon message from another modem.
2
Operation
2.1
Setup
Attach both modems to their respective host systems using matching female SubConn Micro 6
connectors such as MCIL6F, MCBH6F, MCOM6F, MCPBOF6F or MCDC6F. Please make sure to
match the pinout provided in
Electrical and Software Characteristics
.
Apply a suitable supply voltage (12 V – 36 V).
When properly aligned and within communication range, the two modems 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.
WARNING:
bright LED light source, do not look directly at emitter
a few people may experience epileptic seizures when
viewing flashing lights
