Measurement Computing E-1608-OEM - Manual (Page 14)

E-1608-OEM User's Guide Functional Details
14
Connector W2
Header connector W2 provides connections for the DIO, external clock I/O, trigger, counter, power output, and
digital ground reference.
W2 pinout
Pin Signal name Pin description Pin Signal name Pin description
1 DIO0 DIO channel 0 2 DIO1 DIO channel 1
3 DIO2 DIO channel 2 4 DIO3 DIO channel 3
5 DIO4 DIO channel 4 6 DIO5 DIO channel 5
7 DIO6 DIO channel 6 8 DIO7 DIO channel 7
9 GND Digital ground 10 +VO User voltage output
11 GND Digital ground 12 AICKO External clock pacer output
13 AICKI External clock pacer input 14 CTR Counter input
15 TRIG Digital trigger input 16 GND Digital ground
Connector W4
Header connector W4 provides connections for the analog inputs, analog outputs, and the analog ground
reference.
W4 pinout
Pin Signal name Pin description Pin Signal name Pin description
1 CH0H Channel 0 high (SE channel 0) 2 CH0L Channel 0 low (SE channel 1)
3 AGND Analog ground 4 CH1H Channel 1 high (SE channel 2)
5 CH1L Channel 1 low (SE channel 3) 6 AGND Analog ground
7 CH2H Channel 2 high (SE channel 4) 8 CH2L Channel 2 low (SE channel 5)
9 AGND Analog ground 10 CH3H Channel 3 high (SE channel 6)
11 CH3L Channel 3 low (SE channel 7) 12 AGND Analog ground
13 AOUT0 Analog output 0 14 AGND Analog ground
15 AOUT1 Analog output 1 16 AGND Analog ground
Screw terminal connectors
Screw terminals J1 through J3 and J7 through J9 are unpopulated. When populated, the screw terminals provide
alternative connections to the header connectors. Refer to the
Specifications chapter for screw terminal pinouts.
Signal connections
Analog input
You can configure the analog inputs for SE or DIFF mode. The input voltage range is software selectable for
±10 V, ±5 V, ±2 V, or ±1 V.
With SE mode, connect up to eight inputs to CH0x to CH3x . SE mode requires two wires:
 Connect one wire to the signal you want to measure (
CH#x ).
 Connect one wire to the analog ground reference (
AGND ).
With DIFF mode, connect up to four differential inputs to CH0H/CH0L to CH3H/CH3L . DIFF mode requires
two wires plus a ground reference:
 Connect one wire to the high/positive signal (
CHxH ).
 Connect one wire to the low/negative signal (
CHxL ).
 Connect one wire to the analog ground reference ( AGND ).
Floating voltage source
When connecting DIFF voltage inputs to a floating voltage source, make sure the DIFF input channel has a DC
return path to ground. To create this path, connect a resistor from each low channel input to an AGND pin. A
value of approximately 100 kΩ can be used for most applications.