产品介绍：
2 个非隔离RS-422/485，4 路隔离数量量输入和4 路隔离数字量输出
The XW-board series are for uPAC-5000, LP-5000, and WP-5000 series.
One PAC can only plug only one XW-board.
The XW-board series have following common specification:
DI channel is dry contact, sink type.
DO channel is open collector, sink type.
