Weather Radar, Collins Type WCP-701 PN 622-5129-020 pinouts
Connector J1

Power +28 VDC M/L (gnd)
Integral Backlight +5 VDC P/e
On/Off V/G, connect to I/O
Predictive Windshear Auto-On/Disable g/L (gnd), connect to I/O

ARINC429 (low speed)
<h connect to ARINC429 board INPUT A
<j connect to ARINC429 board INPUT B

Bus Supply – WX 1 – AC1 (AC NORM), WX 2 – AC2 (AC NORM)

Reference
ASM 34-41-01, Rockwell Collins CMM WCP-701 34-45-18 pg 2017/2018, 2018/2082 (Apr 18/12)