Connections from the SEII to a 3rd party pulse processor are typically made through the external Scanning Interface Unit's DB-25 rear-panel connector labelled PHA Logic I/O. However, in certain circumstances, a direct connection to the DB-37 connector on the back of a SEII board is allowed. Shown below are the connections.

SEII DB37 SIU DB25 XP3 (ADC Busy) 4/22 --->> 2/15 --->> Ext ADC / Busy In (Pulse Reject) 5/23 <<--- 3/16 <<--- no connection (Live Time) 3/21 <<--- 4/17 <<--- LT Out (Fast Channel) 2/20 <<--- 6/19 <<--- Rate In / Out (PHA Input) 6/24 <<--- BNC <<--- Sig Out

Each signal line has its own ground reference (the pins are listed as signal/ground). The required connections for this pulse processor are shown to the right.