Aaon OE391-12 Modular Service Tool SD used for monitoring and configuring setpoints of Zone Controllers such as VAV/CAV, MUA II, VCM, VCM-X, VCM-X E-BUS, RNE, VCB-X, SA E-BUS.  The modular service tool is connected to the zone controller with the use of a prefabricated cable that comes with the tool.  The mini-Din communication cable is integrated into the Modular Service Tool to connect in any Orion controller that has a mini-Din connector socket for programming, monitoring, and troubleshooting purposes.  

The Modular Service Tool has a black plastic housing and a clear plastic bezel covering on the display screen for protection.  The display features 4-line-by-20-character.  Configuring made easy by the 27-key membrane keypad, entry, and selecting setup is simple with its menu-driven programming.

The Modular Service Tool consists of a 4GB SD memory card, 4 AA 1.5 V batteries, a wall mounts a G034560 DC power supply, a mini-Din communication cable, and an HZ000120 E-BUS communication cable.  The service tool does have an E-BUS port and E-BUS cable for E-BUS Module software. To hard-wire an old controller without a mini-DIN connector socket, you can use the RS-485 port.