Moog Focal 903, User Manual

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903-0628-00 Rev. 1 Model 903-HD User's Guide – FMB-X-2.5
Focal Technologies Corp. Page 4-16
4.3.3 RS-232 Plug-In (AIB-232/TRIGGER)
Card P/N 903-0251-00 (AIB-232)
Card P/N 903-0251-01 (AIB-TRIG)
The AIB-232 plug-in module, which supports RS-232, is shown below in the figure below. No jumper or switch
settings are required since the board is used solely for RS-232 data at rates up to 120 kbaud. In addition to
the ultra-fast fuses on the AIB-4 motherboard, protection for RS-232 inputs and outputs includes transient
voltage suppressors and opto-isolators.
Figure 4-11: AIB RS-232/TRIGGER Plug-In Module
Connector pin designations for the front panel WAGO connector are given in the table below. ISOGND is the
common isolated signal ground for both receive and transmit data. LEDs on the motherboard or adapter cards
can be used to identify the presence and direction of serial data.
Table 4-5: AIB-232 Pin Designations
Pin Designation
1 ISOGND
2 Receive (RXD)
3 Transmit (TXD)
4 Chassis* (optional)
*The chassis pin is normally left open on the mating connector.
The AIB-TRIG plug-in module is a modified version of the AIB-232 that supports trigger signals for responders
and sonars that require trigger voltages b5 and +25 V. For triggers that require 5 V or less, the
AIB-485 card should be used with the TTL configuration.
The RS-232 receiver circuit is unmodified, allowing input signals from -25 V to +25 V but typically configured
for positive trigger voltages from the triggering device of up to +25 V. The RS-232 transmit circuit is modified
to prevent excessive negative voltage excursions, i.e. a diode clamp limits the voltage to no lower than -0.5 V
for connection to the subsea responder. When the trigger input voltage is above +1.5 V at the surface
AIB-TRIG, the RS-232 driver output is held high at the subsea AIB-TRIG, typ8 V with a 3 kΩ load
(+5V min.).
Please consult the factory on recommended interfaces for specific responder triggers.