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Displays not working or showing dashes and random digits

Since the GPS series communicate over a three wire serial connection, check the connections to make sure that the effected signs are not at the end of the serial string of displays.

If they are at the end try connecting displays in a different manor such that the effected displays are in the middle of the serial string and some of the working displays are now at the end of the string.

If the previously working displays are now not working the cable that leads to the first non working display or connections inside the last working display are at fault.

If the same display(s) are still at fault the slave card and or the first digit (dollars) is likely at fault

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