12 points 24VDC digital input (up to 10KHz in 4 points) 8 Points Sink (NPN) transistor digital output (4 points 10KHz output) 1 built-in RS-232 (can be expanded up to 3) 100~240VAC power supply,-------------------------------------------- Địa chỉ : 138 Hương Lộ 11, Tân Quý Tây, Bình Chánh☎ Di động : 0836.019.882 (Mr. Bình) Website : www.thegioitech.com