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Manual revision 041
Section 4: Deploying and Operating MicroCAT
SBE 37-SM RS-232
27
Serial Line Synchronization (Serial Line Sync)
Serial Line Sync allows a simple pulse (a single character) on the RS-232 line
to initiate a sample. This mode provides easy integration with ADCPs or
current meters, which can synchronize MicroCAT sampling with their own
without drawing on their battery or memory resources.
Serial line sync mode is enabled by sending
SyncMode=Y
and then putting
the MicroCAT in sleep state (automatically in 2 minutes or by sending
QS
).
Once in sync mode, sending a pulse causes the MicroCAT to wake up, take a
sample, and store the data in FLASH memory. Transmission of real-time data
is dependent on
TxRealTime
.
Keep the signal line open circuit or within ± 0.3 V relative to ground to
minimize power consumption when not trying to send a pulse to take
a sample.
To disable serial line sync, the MicroCAT must be in the space state when the
sample is finished. Disable sync mode by sending 3 Esc characters; this sets
sync mode to no (it may take up to a minute to come out of sync mode). Then
press any key to wake up the MicroCAT. Once sync mode is disabled
(
SyncMode=N
), you can communicate with the MicroCAT using the full
range of commands (polled sampling, logging, upload, etc.).
Example: Serial Line Sync
(user input in bold)
Wake up MicroCAT. Initialize logging to overwrite previous data in memory. Set current date and time to September 1,
2017 9 am. Set up to transmit real-time data. Set up to send data in converted decimal format, and include temperature,
conductivity, pressure, and salinity with data. Enable serial line sync mode. Send power off command.
(Select
Connect
in Seaterm232’s Communications menu to connect and wake up.)
INITLOGGING
DATETIME=09012017090000
OUTPUTFORMAT=1
OUTPUTTEMP=Y
OUTPUTCOND=Y
OUTPUTPRESS=Y
OUTPUTSAL=Y
TXREALTIME=Y
SYNCMODE=Y
GETCD
(to verify setup)
QS
(MicroCAT responds with message confirming that it is now in serial line sync mode)
When ready to take a sample:
(To save real-time data, click Capture menu to capture data to a file – Seaterm232 requests file name for data to be
stored.)
Send a pulse – press any key – to wake up, take and transmit 1 sample, store in memory, and go to sleep.
Repeat as desired.
When ready to upload all data to computer, disable serial line sync mode, and then upload data and go to sleep:
(Press Esc key 3 or more times; MicroCAT disables sync mode [sets
SyncMode=N
]. Press any key to wake up
MicroCAT.)
GETCD
(to verify MicroCAT is communicating, and that sync mode is set to no)
(Click Upload menu – Seaterm232 leads you through screens to define data to be uploaded and where to store it.)
QS
Note:
Use
GetCD
or
DS
to view Serial
Line Sync enable/disable status.