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GPS into a 4640
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Posted 9/8/2021 21:44 (#9210109 - in reply to #9208904)
Subject: RE: GPS into a 4640

Pinout number are located on the back side of the
connector (where the wires are inserted).
To Setup RS232 Serial Port 1 on a GS3 Display
RS232 Wire Display Connector Pin #
Blue Pin 23 = Rx
Green Pin 22 = Tx
White Pin 25 = CTS
Red Pin 24 = RTS
Black Pin 2 = Ground
To Setup RS232 Serial Port 2 on a GS3 Display
RS232 Wire Display Connector Pin #
Blue Pin 15 = Rx
Green Pin 26 = Tx
White Pin 17= CTS
Red Pin 16 = RTS
Black Pin 4 = Ground
1. Remove the square connector from the back of the
GS3 display and from all power sources on the vehicle.
2. The square AMP 26-pin display connector has a built
in pin locking mechanism.
a. Locate the large single white locking tab.
b. Using a flat screwdriver, depress this tab. It will
depress approximately 3 mm (1/8 in.).
c. Two tabs on the opposing side will become exposed
once the single large tab is depressed.
d. Once these two white tabs are exposed, the
connector pins are unlocked.
3. Use the chart at the beginning of this instruction to
determine the pin locations for the desired Serial Port
you will utilize (for example: Serial Port 1 uses pin
locations 2, 22, 23, 24, & 25). Pin location numbers
are stamped into the black housing on the back of
the connector.
4. Remove the white plugs for the correct pins you will
add the RS232 wires to. The white plugs will pull out
easily with small needle-nosed pliers.
5. Insert harness wires into correct pin locations. You
may need to utilize a needle-nosed pliers to push the
connections forward through the orange seal in the
6. Once you have all 5 wires pushed up flush to the front
of the connector face, you need to lock the pins back
in place by pushing down on the 2 white locking tabs
until they are flush.
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