Control of RS-232 and -485 Modbus remote-terminal-unit (RTU) devices is the province of ICS Electronics’ Model 9009 multifunction interface board. Designed for OEM applications, the 9009 adds Ethernet, GPIB, or USB interfaces to temperature chambers, temperature plates, or other Modbus RTU slaves to facilitate control from standard test programs or industrial programmable logic controllers (PLCs). The Ethernet port supports VXI-11 and raw socket protocol, Modbus TCP/IP conversion, and an internal HTML Web server. VXI-11 and raw socket commands can be used to control the 9009 or any connected Modbus slave devices. The GPIB interface is IEEE-488.2-compliant. GPIB command strings can be used to control the 9009 or be converted into Modbus RTU packets to control any connected Modbus devices. The USB interface employs Microsoft’s Universal Serial Driver, which operates on any Windows PC. RS-232 and RS-485 interfaces can be connected directly to a single Modbus slave or to multiple Modbus devices via an RS-485 network. The 5- by 5-in. board also can be used with LXI test systems.