Page
58
of
254
Version
6.3
Rev
r012
Date
05-11-2022
Part No. 96000001
The standard time message is an NMEA sentence identified as $GPZDA and is expected to arrive
after the PPS. The time message will also, usually, go to the data collection computer, so the ZDA
message must either be split or output on two of the GPS receiver’s RS-232 ports. The $GPZDA and
UTC message can be input to the SIM either via serial or Ethernet.
4.1.4.2
Trimble UTC:
UTC yy.mm.dd hh:mm:ss ab<CR><LF>"
Trimble GPS receivers provide the PPS time synchronisation message with an ASCII UTC string and
not the ZDA string. The SIM expects the UTC to arrive 0.5 seconds before the PPS. When interfacing
a Trimble GPS, use the UTC message and not the ZDA for timing information. If both the ZDA and
UTC are input, the UTC will take priority; the SIM will automatically ignore ZDA while receiving UTC.
The UTC status code (‘ab’) is ignored.
Setting up the time synchronisation is done through the Sonic Control software detailed in
In that each of the SIM serial ports provides 12VDC on selected pins, it is not recommended to use a
fully wired serial interface cable as this may cause some GPS receivers to stop sending data. Use a
cable with only pins 2, 3, and 5 wired, if possible.
4.1.5
Motion Input
The roll component, of the motion data, is used for roll stabilisation. Supported formats and
connection are:
•
TSS1
Serial or Ethernet
•
IXSea TAH
Serial or Ethernet ($PHOCT)
•
MiniPOS3
Serial or Ethernet
When using serial communication, it is recommended to set the motion sensor to output the
highest baud rate and highest update rate possible, preferably 100 Hz or higher.
Connect the motion data to the DB-9 labeled Motion, on the SIM, or via Ethernet input to one of the
RJ45 AUX receptacles. Setting up the serial port or Ethernet parameters is done through Sonic
Control, which is covered in
4.1.6
SVP input
4.1.6.1
Connecting the sound velocity probe
The sound velocity probe is used to provide the sound velocity at the sonar head, which is used for
the receive beam steering. It is not used for refraction correction; that must be accomplished in the
data collection software employing a full water depth sound velocity cast. The SVP data can be
interfaced either by serial or Ethernet.
4.1.6.2
Valeport miniSVS
The miniSVS comes with a 15 metre cable. The cable carries both the DC power (8 – 29V DC) to the
probe and the data from the probe to the SIM. The miniSVS is set for a baud rate of 9600 and will
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Страница 158: ...Figure 174 Smooth log information copied from a real time survey log...
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Страница 237: ...Page 237 of 254 Version 6 3 Rev r012 Date 05 11 2022 Figure 215 Sonic 2026 Projector...
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Страница 247: ...Page 247 of 254 Version 6 3 Rev r012 Date 05 11 2022 Figure 225 SIM Stack Outline...
Страница 249: ...Page 249 of 254 Version 6 3 Rev r012 Date 05 11 2022 Figure 227 Locking Ring type Deck Lead...
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Страница 253: ...Page 253 of 254 Version 6 3 Rev r012 Date 05 11 2022 Figure 231 I2NS SIM Dimensions...
Страница 254: ...Page 254 of 254 Version 6 3 Rev r012 Date 05 11 2022 Part No 96000001 Figure 232 Dual Head Mount Offsets...