Measurement Computing USB-1808-OEM, User Manual

Page: 10 / 29

USB-1808-OEM User's Guide Functional Details
10
Single-ended mode pinout
Terminal Terminal
# Label Use # Label Use
1 CH0H AI channel 0 HI 29 NC No connection
2 NC No connection 30 CH7H AI channel 7 HI
3 AGND Analog ground 31 AGND Analog ground
4 CH1H AI channel 1 HI 32 NC No connection
5 NC No connection 33 CH6H AI channel 6 HI
6 AGND Analog ground 34 AGND Analog ground
7 CH2H AI channel 2 HI 35 NC No connection
8 NC No connection 36 CH5H AI channel 5 HI
9 AGND Analog ground 37 AGND Analog ground
10 CH3H AI channel 3 HI 38 NC No connection
11 NC No connection 39 CH4H AI channel 4 HI
12 AGND Analog ground 40 AGND Analog ground
13 +VO +5V power output 41 AOUT0 AO channel 0
14 AGND Analog ground 42 AOUT1 AO channel 1
15 GND Digital Ground 43 AGND Analog ground
16 TMR0 Timer 0 output 44 GND Digital Ground
17 TMR1 Timer 1 output 45 DIO0 DIO channel 0
18 ICLKO Input scan clock output 46 DIO1 DIO channel 1
19 OCLKO Output scan clock output 47 GND Digital Ground
20 GND Digital ground 48 DIO2 DIO channel 2
21 ICLKI Input scan clock input 49 DIO3 DIO channel 3
22 OCLKI Output scan clock input 50 GND Digital Ground
23 ITRIG Input Trigger 51 CTR0 Counter 0 input
24 OTRIG Output Trigger 52 CTR1 Counter 1 input
25 GND Digital ground 53 GND Digital ground
26 ENC1A Encoder 1 Input A 54 ENC0A Encoder 0 Input A
27 ENC1B Encoder 1 Input B 55 ENC0B Encoder 0 Input B
28 ENC1Z Encoder 1 Input Z 56 ENC0Z Encoder 0 Input Z
LEDs
The USB-1808-OEM has two LED indicators that indicate the status of power and data. The LEDs are stacked
one above the other (see Figure 2 on page 8).

The
Status
LED turns on when the device is detected by the computer.

The
Activity
LED blinks when data is transferred and is off otherwise.
Analog input
You can configure each analog input channel for either SE or DIFF mode. MCC recommends connecting
unused analog input terminals to analog ground terminals during operation. For example, if you are not using
CH7L
, connect this terminal to an available
AGND
terminal.
The input voltage range is software-selectable per channel for ±10 V, ±5 V, 0 V to 10 V, or 0 V to 5 V.
Analog input operations can be paced by the internal clock or by an external clock (
ICLKI
– refer to
Clock I/O
on page 15). They can be initiated by a digital trigger ( Digital triggering on page 15) or a pattern trigger
( Pattern triggering on page 15).
Refer to Synchronous I/O – mixing analog, digital, and counter scanning on page 15 for information on running
analog input scans at the same time as other subsystem scans.
For more information about analog signal connections
For more information about analog input connections, refer to the
Guide to DAQ Signal Connections
(available
for download at www.mccdaq.com/support/DAQ-Signal-Connections.aspx ).