Up for sale is a brand new Federal Signal Serial Interface Module (8583469E). It is brand new and unused, and comes with the black module box and cable. 

From the Federal Signal website:

• Enables a Federal Signal Convergence Network (serial) product to connect to a traditionally wired siren, switch, relay, or controller 
• Black, plastic housing
• All programming features are externally accessible

FEATURES

The Serial Interface Module is a device to communicate with Convergence Network (serial) controlled light bars, ILS systems, and CN SignalMasters™. To minimize the number of discrete wires (traditional individual wires) to the light bar, control lead functions are wired to the Serial Interface Module. The information is converted to a digital format and communicated to the light bar via the serial communication cable. 

Easy Programmability

All programming features, such as light bar pattern selection, front/rear cutoff, intersection mode, and SignalMaster control, are externally accessible. There is no need to open the module or access it internally.

INSTALL INSTRUCTIONS

https://www.fedsig.com/resource-document/file/8148