RS232 /GPS OPTION
WiththeRS232optiontheRMD-1ControlBoxcanbeconnectedto
anycomputer ordata recorderequipped withan RS232input. The
specification of the interface is as follows: 8 bit, 4800 baud rate, 1
stop bit, and no parity bit.
TheGPS/Loran Cinterface allowsthe ships positioninformation to
beinputintotheRMD-1. TheRMD-1thenreformatstheinformation,
combinesitwiththesignalstrengthreadingfromthesearchcoil,and
sends it to an external computer via the RS232 interface.
Any GPS or Loran C receiver equipped with a NMEA 0183 output
canbeusedwiththeRMD-1. Ifyouarenotsureifyourreceiverhas
NMEA0183output,checkitsmanualorcallthemanufacturer. You
mayfindthatyouhavetotellyourGPSreceivertosendoutthe0183
information (refer to your GPS manual). If given a choice, select
0183Aor0183Cformat. Bothversionsincludethelatitude/longitude
message format called GLL. The RMD-1 can also receive the
message format called GGA, if the message GLL is not available.
The RMD-1 automatically checks for the presence of either mes-
sage on power-up.
The sample message sent on the RS232 interface is as follows:
Position 4151.745353, N, 07102.394576, W <cr>
RMD= 3270mv <cr> <cr>.
Where the "Position" is the latitude and longitude coordinates from
the GPS or Loran C receiver and "RMD" is the detection signal
strengthsexpressedfrom0to5,000millivolts(0to5.000volts). The
complete message is repeated once per second.
If a GPS or Loran C is not being used, or if the GPS or Loran C
messageisnotbeingproperlyreceivedbytheRMD-1,themessage
will be as follows:
NO POSITION AVAILABLE <cr>
RMD = 3270mv <cr> <cr>.
4
UNDERWATER HOUSING:
Contains downstairs electronics board.
Can be powered from surface Control
Box(standard)orfromlocalROVpower
(9-36vdcat8w).Electronicsboardcan
beremovedfrom housing and mounted
in ROV. Electronics board output is
RS232, or analog, or a proprietary sig-
nal to surface Control Box (standard).
SURFACE CONTROL BOX:
Contains switches and controls
for operating the system. When
metalisdetectedby the coil, the
meter in the Control Box swings
up and the audio alarm sounds
off. Control Box also has an op-
tional RS232 and analog output
for computer or chart recorder
connection. System can be op-
erated without the Control Box
byapplying powerdirectlyto the
underwater housing.
JWFISHERSMFG
INC
BERKLEY, MA 0 2779
65 AN TH ON Y ST
VISUAL DETECT ION DISP L AY
POWER
AUDIO
Underwater
Housing Up to a 1,000 foot of cable
Surface Control
Box
OutPut
(RS232 or Analog)
Input Power
(120/240 vac
or 9-36 vdc)
2 or 4 wires
RMD-1 SYSTEM CONFIGURATION
CABLE:
Can use umbilical cable from
ROVoraseparatecable. A 4
wirecableisrequiredifpower
to the U/W housing electron-
ics is from the surface; 2
wires if power is from ROV.
COIL:
High noise immunity coil
set. Standard coil set is 10"
x 16" x 5". Larger coils are
available by special order.
Full ocean depth coils are
also available.
4 foot cable
standard
