24 points 24VDC digital input (up to 10KHz in 4 points)16 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