Powering from the computer’s serial (COM) port, Omega Engineering’s OM-CONV-SER RS-485 half duplex to RS-232 converter presents data rate handling of up to 115,200 bps. The 2.4” × 1.3” × 0.6” unit offers transmission distances of 1,200 m on the RS-485 side and 5 m on the RS-232 side. The CE-compliant device connects to a standard DB9 (COM) port. The product suits PLC applications and industrial automatic control and measuring systems. From $25.