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milford instruments

Picaxe LCD problem


A friend of mine is using a picaxe 20m2 to drive a milford instrument 20x4 LCD with a serial backpack. However, when he turns it on, it just comes on with a screen filled with triangles. The LCD is connected to pin 0 .The code he's running is below. What is the problem?

PS: This is my first post, so sorry if it's in the wrong place.