The pcm 3725 is an 8 channel relay actuator and 8 channel isolated digital input module that attaches to the pc104 connector on your cpu card or pc104 module it offers eight relay actuators and 8 bit isolated digital input channelsadvantechs usb data acquisition modules such as the pcm 3725 are known for their user friendly design they are an alternative to traditional serial and parallel devices that require no external power supply and are hot swappable thus a simple upgrade and mai