通讯扩充板FBs-CBE乙太（Ethernet）网络界面之扩充通讯模组FBs-CB21埠RS232（Port2)之扩充通讯板FBs-CB222埠RS232（Port1+Port2)之扩充通讯板FBs-CB51埠RS485（Port2)之扩充通讯板FBs-CB552埠RS485（Port1+Port2)之扩充通讯板FBs-CB251埠RS232（Port1)+1埠RS485（Port2)之扩充通讯板)