file: sbe48_setup.html
10 Apr 2003

SBE48 Setup for HullCom/SST Operation

A properly configured SBE48 is required for operation in the HullCom/SST subsystem. If the SBE48 does not display the Status info below in response to a DS command, you MUST make the appropriate changes before using the SBE48 in the subsystem. 


       SBE48 V 1.0  SERIAL NO. 0010    01 Nov 2002  15:39:23
       logging data
       sample interval = 60 seconds
       number of samples to average = 60
       samplenumber = 202352, free = 97241
       serial sync mode disabled
       real-time output disabled 
       temperature = 23.75 deg C

SBE 48 Hardware Set Up Notes

Pinouts at the MCBH5M bulkhead connector are as follows: 

       pin 1    blk     ground
       pin 2    org     commands to SBE 48
       pin 3    red     +8 to +16 volts
       pin 4    brn     data from SBE 48
       pin 5    shd     not connected

An internal Ultralife Lithium Battery Model U9VL (non-hazardous) provides backup power and may be drawn upon when testing or setting up this instrument. If an external supply greater than 9 volts is connected, the SBE 48 will draw from that supply only. With a 12 volt external supply, S/N 0001 drew about 12 ma (average) for 1.1 seconds.

Data are stored in FLASH memory while setup information and calibration coefficients are in EEPROM. Battery or external power is not required to retain this information. The real time clock, however, requires power from either the internal battery or the user's external supply.

Communication and Set Up Parameters -

A. First setup the equipment:

B. Once powered up and connected via Procomm or equivalent:

  1. Press ENTER to establish communication; S> will appear. Note that communications mode times out after 2 minutes of no keyboard activity. If this happens, press ENTER again to re-establish communications.

  2. Enter DS to display SBE 48 status. A properly configured SBE48 will return: 
    	SBE48 V 1.0	SERIAL NO. 0010	01 Nov 2002		15:39:23
	logging data
	sample interval = 60 seconds
	number of samples to average = 60
	sample number = 202352,	free = 97241
	serial sync mode disabled
	real-time output disabled
	temperature = 23.75 deg C
	S>
  3. If the instrument has been deployed and the data is to be recovered use the following commands (CR follows each command): 
    	STOP		(stop logging )
	DS		(check the number of samples that have been recorded)
	Alt-F1		(put Procom in the logging mode.  xmode, file name, page down)
	dd1,N		(where 1 was the first sample and N is the last)
	Alt-F1		(stop logging and close file)
  4. To prep the instrument or to set the instrument up the first time, use the following commands (CR follows each command): 
    	STOP		(stop logging)
  5. Check the internal lithium battery. If the DS command says "low battery" or if the battery has been in operation for more than one year then open the case and replace the battery. 
    	BAUD = 9600	(set baud to 9600)
	TXREALTIME = N	(disable real-time output)
	SYNCMODE = N	(disable serial sync mode)
	DDMMYY=220800	(Set date - 22 August 2000)
	HHMMSS=123456	(Set time - 56 seconds past 12 hrs and 34 min - use UMT)
	INTERVAL=60 	(sample temperature once per minute (i.e., every 60 seconds)
	NAVG=60		(To keep an hourly running average  of 60 samples)
	SAMPLENUM=0 	(sets the memory pointer to 0)
	DS			(check that the setup is as desired)
  6. To start logging immediately, enter STARTNOW. A sample will be taken every INTERVAL seconds. It is recommended to do this just before going on the ship.

  7. To interrogate the SBE 48 for running averages during deployment, press ENTER (or send any ASIII character) to put the SBE 48 in communications mode (S> returned). If the character happens to be sent during the brief time the SBE 48 is actually sampling, the S> will not be returned and the wake-up character will have to be sent again. Upon receipt of the S>, send SAQS[CR-LF]. The SBE 48 will return the average temperature (degrees C T90) of the previous 60 samples (if NAVG was set to 60). This is done by the HST board.

  8. To install, coat the copper disk liberally with heat grease and mount the SBE 48 on the inside of ship's hull (below waterline). The magnets will hold the SBE 48 to the hull.

Typical responses

Here are some typical responses to commands. Note that the DC command yields the calibration coefficients established during calibration. 

S>
S>ds
SBE48 V 1.0  SERIAL NO. 0001    22 Aug 2000  13:25:47
not logging: received stop command
sample interval = 60 seconds
number of samples to average = 60
samplenumber = 10, free = 299583
serial sync mode disabled
real-time output disabled
temperature = 24.31 deg C

S>dc
SBE48 V 1.0  0001
temperature:  16-aug-00
    TA0 = -6.343950e-05
    TA1 = 2.887996e-04
    TA2 = -3.336683e-06
    TA3 = 1.842974e-07
rtc:  no-cal
    RTCA0 = 1.000000e+00
    RTCA1 = 0.000000e+00
    RTCA2 = 0.000000e+00

Note: because the SBE 48 is expected to operate in a relatively constant temperature 
environment, temperature correction for the real time clock is not  performed.

S>dd1,10
start time =  22 Aug 2000  13:15:50
sample interval = 60 seconds
start sample number = 1

 23.4705, 22 Aug 2000, 13:15:50
 23.4719, 22 Aug 2000, 13:15:53
 23.4733, 22 Aug 2000, 13:15:56
 23.4745, 22 Aug 2000, 13:15:59
 23.4757, 22 Aug 2000, 13:16:02
 23.4762, 22 Aug 2000, 13:16:05
 23.4951, 22 Aug 2000, 13:16:08
 23.9538, 22 Aug 2000, 13:16:11
 24.4714, 22 Aug 2000, 13:16:14
 24.6957, 22 Aug 2000, 13:16:17