iSMA-B-24I Qty: -+ SKU: iSMAB24I $442.37 Quantity discounts available QuantityPrice Add to Cart Call for Availability - (510) 636-7900 DetailsDetailsI/O module with Modbus RTU/ASCII or BACnet MSTP communication. 1xRS485, 24xDI. Power supply 24 V AC/DC.