How is DME station ident coded in ARINC 429?
Labels 246 and 247 describe up to 4 7-bit ASCII characters.

1th char: Bits 11-17 of 246
2th char: Bits 19-25 of 246
3th char: Bits 11-17 of 247
4th char: Bits 19-25 of 247

For AGG, in ASCII we get 0x41, 0x47, 0x47, then:

Label 246 = 0x11D04A6
Label 247 = 0x11CA7

SSM encoding is the same as regular discrete labels.
I am not familiar with labels 242/244.