Moog Focal 903, Руководство пользователя

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903-0628-00 Rev. 1 Model 903-HD User's Guide – FMB-X-2.5
Focal Technologies Corp. Page 4-20
4.3.5 Tritech Sonar ARCNET Plug-In (AIB-ARCNET)
Card P/N 903-0261-00
The AIB-ARCNET plug-in module, which supports the version of ARCNET used by sonars manufactured by
Tritech International Ltd., is shown in the figure below. In addition to the ultra-fast fuses on the AIB-4
motherboard, protection for Tritech inputs and outputs includes transient voltage suppressors and AC-coupled
isolation through capacitors and transformers.
JP3
JP1
JP4
JP5
Figure 4-14: AIB Tritech ARCNET Plug-In Module
The Tritech sonar interface may be configured for +5 V (default) or +12 V drive levels and a data rate of
156.2 kbps (default) or 78.1 kbps, as shown in the table below. The +12 V drive setting may be needed for
long cable runs to the sonar equipment, but is typically not required. The lower data rate setting is available
for compatibility with existing sonars configured for 78.1 kbps operation.
Table 4-8: Configuration Settings for AIB Tritech Module (Defaults Shaded)
Output Drive Level
VALUE JP1 JP3 JP5 JP4
+5 V Output 1-2 * * *
+12 V Output 2-3 * * *
Baud Rate
78.1 kbaud * 1-2 1-2 *
156.2 kbaud * 2-3 2-3 *
Termination
68 Ohms * * * 1-2
Unterminated * * * 2-3
*Setting does not affect given parameter
The Tritech interface lines may be terminated with jumper JP4: for an internal 68 ohm terminator, pins 1 and
2 of jumper JP4 should be shorted (default); for no internal terminator, pins 1 and 2 of jumper JP4 should be
left open (short pin 2 to pin 3, which is open, to store the shunt).
In most applications, the 68 ohm terminators on the AIB cards should be enabled. One exception is when the
sonar head has a 39 ohm terminator installed with a “short” cable connection to the multiplexer. In this case,
the 68 ohm terminator on the AIB card should be disabled. (But the preferred configuration is with no
terminator on the sonar head and the 68 ohm terminator on the AIB card.)