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The serial header on the controller uses a 3POS symetrical orientation. This means that, of the 3 conductors used, the middle conductor is ground and the TX and RX
are on the outside pins. Therefore, one can simply reverse the connector to correctly align the TX and RX pins. This makes wiring the DB-9 much easier and allows you to
function the serial port as an input (i.e. GPS or other) or as an output (i.e. feeding data to a computer) by simply flipping the cable connection on the IMU.
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DB-9
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Function
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Abbreviation
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Pin
#1
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Data
Carrier Detect
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CD
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Pin
#2
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Receive
Data
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RD
or RX or RXD
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Pin
#3
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Transmitted
Data
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TD
or TX or TXD
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Pin
#4
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Data
Terminal Ready
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DTR
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Pin
#5
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Signal
Ground
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GND
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Pin
#6
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Data
Set Ready
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DSR
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Pin
#7
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Request
To Send
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RTS
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Pin
#8
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Clear
To Send
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CTS
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Pin
#9
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Ring
Indicator
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RI
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The only pins we need to be concerned with are pins #2, #3 and #5. All others are unused by the controller board. Cut a small piece of ribbon cable (2-3 inches) and trim off only 3 conductors (out of 10).
Attach 3 crimped box terminals (female) to one end of the wire. The crimping processes is delicate and is best done with a steady hand a pair of needle nose pliers. Solder the DB9 pin #5 to the middle
wire on the ribbon cable end opposite the crimped terminals. Use a small amount of solder to secure the crimped terminals onto the wire.
Then, solder the DB9 pins #2 and #3 to the outer-two conductors (arbitrarily). Then, insert the crimped box terminals into a 3POS connector, making
sure that the middle conductor (which should be soldered to pin #5 of the DB9) is in the middle position of the 3POS connector.
You will need a 7.2V power source to attache to J3 to power the circuit. Another .1inch 3POS Connector is supplied for making this cable.
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