0  TTCout0  L1Accept trigger
1  TTCout1  ECReset
2  TTCout2  BCReset
3  TTCout3  Calibrate strobe
4  TTCout4  SerialID
5  TTCout5  SerialTT
6  TTCout6  FEReset
7  TTCout7  Spare command
8-15 reserved = 0