Technical description
HF SSB Transceiver 9323/9360/9390/9780 Technical Service Manual 4-45
Table 4 -19: Enabling ports
S1 dip 1 switch GPS S1 dip 2 switch Computer
off enabled off enabled
on disabled on disabled
©
Disabling unused ports will reduce data processing time.
RS232/I
2
C Interface address
If you have two RS232/I
2
C Interface units connected to one transceiver or control
console, then each unit must be set to a different address. To do this you set S1
dip 3 switch as detailed in the table below.
Table 4 -20: RS232/I
2
C Interface addresses
RS232/I
2
C S1 dip 3 switch
First unit off
second unit on
©
Either RS232/ I
2
C Interface can be identified as the first unit.
Technical description
1 04-03086
The RS232/ I
2
C Serial Interface unit is used to interface transceivers 9323, 9360
and 9390 or the remote control console 8570 via the I
2
C bus of the "Option R"
connector. The 87C654 microprocessor controls the I
2
C bus protocols and data
exchanges to the transceiver or control console. The I
2
C line levels are driven by
IC5. LC filters on the I
2
C minimise microprocessor noise into the transceiver.
Each serial port is driven by the same microprocessor with RS232 line level
conversion using a MAX231 driver IC4. Signal levels on the microprocessor side
of IC4 are TTL compatible, while signals on the line side are at true RS232 levels.
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