Pocket-Sized RS-232/Serial Break Out Box w/ Jumpers & DB25 Female to DB25 Female

BK Precision IT-131 RS232 Communication Interface

Chint DDSU/DTSU666 DIN Rail Energy Meter Mini Digital Meter RS485 Communication

RS232 DB25 Breakout Box Serial Tester Diagnostic Interface w Jumper Wires

Datacom Technologies Model 15 Four State Serial Interface Tester (item #157)

RS232 to RS485 Serial Converter Adapter for Field Use 93x32mm Lightweight

PZEM-017 DC Voltage Current Power Energy Consumption Meter Communication Module