4.1 Analog I/O Header – J3

Diamond-MM-32DX-AT provides a 50-pin header on the right edge of the board labeled J3 for all I/O relating to analog functions. Pin 1 is in the upper left corner.

Signal Name	Definition
Vin 15/15+ ~ Vin 0/0+	Analog input channels 15 - 0 in single-ended mode; High side of input channels 15 - 0 in differential mode
Vin 31/16- ~ Vin 15/0-	Analog input channels 31 - 16 in both single-ended mode; Low side of input channels 15 - 0 in differential mode
Vref Out	Precision +5V signal for reference only. Do not use for power
Vout 0 - 3	16-bit standard, (12-bit optional) analog output channels
A/D Convert	A/D convert signal output; can be used to synchronize multiple boards
Dout 2 – Dout 0	Digital output port with counter/timer functions
Din 3 – Din 0	Digital input port with counter/timer and external trigger functions
Extclk	External A/D trigger input; Also used for digital interrupt (DINT) input
Extgate	Pin to control gating of Ctrs 1& 2 for A/D timing
Gate 0	Pin to control gating of Ctr 0
Clk 0	Input source to Ctr 0
+5V	Connected to PC/104 bus power supply
Agnd	Analog ground; connected to digital ground at a single point at DC/DC converter PS1 on board
Dgnd	Digital ground; connected to PC/104 bus ground