Whilst testing, when the subnet faults (by disconnecting serial connection) how do we then reset the fault?
Reconnecting the serial leaves Led 5 still red and no comms.
I would make sure that Module Reset under the HMS-EN2SE-R Settings is enabled.
I would also update the Transaction settings, maybe increase the retries and reconnect time. It should continue to work after a momentary disconnection, but you can use the Control Word to reset (disble/enable) the network (see page 76 in the User Manual).