Technical Manual Technical Description
© SPECTRA ENGINEERING 2006 Revision 4.2.3
61
3.18 T29 Balanced and Isolated VF plus E&M
3.18.1.1 Description
Option T29 provides the balanced and isolated VF I/O as well as isolated E
(PTT) and M (Mute) leads, as per option T05. The option has been design to
be compatible with Omitronics interface connections.
Note
Jumpers referred to in the table below are those on this option PCB.
The E lead is opto isolated and may be asserted by applying a DC voltage
between 5V and 48V with any polarity between CN9 Pins 1&2 (JMP1 in
position 2-3).
Provision is also made to internally source the activation voltage (+12V DC)
in which case the E lead is asserted by grounding CN9 Pin2 (JMP1 in
position 1-2)
The M lead is relay isolated and the common and normally open contacts are
brought out via CN9. If the internal +12V DC is being used as the activation
voltage for the E lead (JMP3 in position 1-2) then the normally closed contact
is also available at CN9 pin 8. The relay contacts are rated at 500mA.
Figure 3-13 MX800 T29 otpion board
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