GAI-Tronics 69439-001 External Audio Interface (EAI) - Manual (Page 5)

Pub. 42004-677L2C
Model 69439-001 External Audio Interface Page: 5 of 9
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Switch and Jumper Settings
Several switch and jumper setting are required for proper operation of the EAI Card. The following
settings are set during the system commissioning and programming and should not be changed. If
replacing an existing EAI card for maintenance purposes, be sure to duplicate the switch and jumper
settings of the card being replaced. Refer to Figure 6 for switch and jumper locations.
The 2xx/3xx Address (P1) shorting clip selects part of the base input/output port address used by the MCU
when accessing the EAI.
The Board Address (S3) rotary switch selects part of the base input/output port address used by the MCU
when accessing the EAI.
The Board Identification (S4) rotary switch lets the MCU distinguish between multiple EAIs installed in
the same card rack.
The Test Enable (S1) rotary switch is used during production testing of the board. Set this rotary switch
to “0” during normal operation.
The Register Address (S2) rotary switch is used during production testing of the board. Set this rotary
switch to “0” during normal operation.
Internal Features
The EAI contains a 1.00 kHz sine wave detector for use in the supervision of several internal audio paths.
The EAI contains two 2-wire to 4-wire conversion circuits for accessing the party line 1 and party line 2
card rack audio busses. Each of those two card rack busses has a dedicated circuit.
Operation
After installation, the Model 69439-001 External Audio Interface (EAI) should start automatically. The
EAI requires no direct user intervention during normal operations. See your system manual for more
information on how the EAI operates in your customized system.