The Tektronix VX4353 Relay Switching Module is a printed circuit board for use in a mainframe conforming to the VXIbus specifications, such as the VX1400 “C” size mainframe used in the Tektronix / CDS IAC system. The Module provides 32 independently controlled single-pole, single-throw relays. Individual relays or all relays can be opened or closed under program control.