1. what to be done(high/Low) for RCOUT Pin no:7 in ADUM5402
2. what need to be done for VE1 Pin no:7 in ADUM3402
Answer to your second question:
VE1 is the Output Enable 1 for VOC and VOD (logic outputs) on ADUM3402. VOC and VOD outputs are enabled when VE1 is high (it is active high) or disconnected. VOC and VOD outputs are disabled when VE1 is low. In noisy environments, however, connecting VE1 to an external logic high or low is recommended.