903-0628-00 Rev. 1
Model 903-HD User's Guide – FMB-X-2.5
Focal Technologies Corp.
Page 4-24
4.3.7 MS-900 Analog Sonar Plug-In (AIB-MS900)
Card P/N 903-0250-00 (AIB-MS900)
Card P/N 903-0250-01 (AIB-MS900L modified for low frequency (LF))
The MS900 Analog Sonar Interface AIB plug-in (AIB-MS900) is compatible with the analog telemetry used by
the Mesotech MS900 sonar system. The AIB uses only one configuration jumper, J11, shown in the figure
below. Pin 1 of J11 is the square pin, which is also marked with a silk-screened "C". If the jumper is placed
across pins 1 - 2, the board is configured for the console module, which interfaces with the MS900 controller.
With the jumper across pins 2 - 3 of J11, the board is configured for the remote module, which interfaces with
the Model 971 sonar head. No other jumper settings are required.
J11
Figure 4-16: MS-900 Plug-In Module (Top View)
The MS900 interface must be installed on a motherboard or adapter card supporting AIB plug-ins, such as the
AIB-4 or the HDB-TX.
Because of the high-speed sampling required, the MS900 plug-in cannot be used in the medium-
speed data slots on the Model 903. The MS900 plug-in can be used with the GLINK-based Model 903
high speed data slot (typically adjacent the FMB). The 2.5G Model 903 systems (with FMB-X-2.5)
support the MS900 module in any data slot.
Pin designations for the AIB-MS900 plug-in modules are given in the table below. The polarity of the signal
lines does not matter.
Table 4-13: AIB-MS900 Pin Designations
Pin
Designation
1
Chassis * (optional)
2
N/C
3
Sonar Signal/Data
4
Sonar Signal/Data
*The chassis pin is normally left open on the mating connector.
The standard AIB-MS900 plug-in is designed for compatibility with the high frequency (HF) telemetry system
used by the MS900 system. The card may be modified to the AIB-MS900L version for compatibility with the
less common low frequency (LF) analog telemetry system, used mainly for commercial fishing applications.
Sonars with digital telemetry, such as the MS900D and MS1000, should be used with a digital serial interface
AIB plug-in, such as the AIB-485 or AIB-232.
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