Summary of the pin layout of the ESD segments as seen from the air-side feed-through connector. Same configuration for ITMY, ITMX, ETMY, and ETMX.

Pin 1 - LR
Pin 2 - UR
Pin 3 - BIAS
Pin 4 - UL
Pin 5 - LL

Following E1400430, Pin 1 is slightly offset in spacing from the other pins. New style feed-through has a one to one pin layout (pins are not flipped inside flange).

ITMX/ITMY alog 39744
ETMX alog 19221
ETMY alog 15656