Advantech ADAM-4017+-F Remote I/O Module, 8-Channel Analog Input Module with Modbus, RS485 Interface, 16-Bit Resolution, 8 Differential Channel Inputs, 51 x 85 x 150mm (HWL), ADAM 4000 Series $340.20 Select
Advantech ADAM-4520-F Isolated RS-232 (DB9) to RS-422 (4-Wire)/485 (2-Wire) Converter, 10-30VDC, Revision EE $112.40 Select