Measurement Computing DAQFlex User Guide - Manual (Page 124)

DAQFlex Software User's Guide Hardware Reference – USB-7204
124
Hardware features
 Two digital ports. Each port is individually configurable as input or output.
 Eight analog input channels, numbered 0 to 7.
 Analog input mode is configurable for single-ended (eight channels) or differential (four channels).
Possible gain ranges:
o ±20V (differential mode)
o ±10V (differential or single–ended mode)
o ±5V (differential mode)
o ±4V (differential mode)
o ±2.5V (differential mode)
o ±2V (differential mode)
o ±1.25V (differential mode)
o ±1V (differential mode)
 External trigger input
 External pacer input / output. This feature allows multiple devices to acquire synchronized samples.
One master device is used to drive the signal. Additional devices must be configured as slave
devices using the "AISCAN:EXTPACER=value" message. Value may be "ENABLE/MASTER,"
"ENABLE/SLAVE," or "ENABLE/GSLAVE."
o When set to ENABLE/SLAVE, the first clock pulse after setting up the scan is ignored to ensure
adequate setup time for the first conversion. Use this mode when the device is paced from a
continuous clock source.
o When set to ENABLE/GSLAVE, the first clock pulse after setting up the scan is held off to ensure
adequate setup time for the first conversion. No pulses are ignored. Use this mode when the
device is paced from another USB-7204.
 1,024 bytes of nonvolatile EEPROM memory; used for storing configuration information, calibration
data, and user data.
 RATE takes a float value. If the input scan rate requested is less than the slowest rate supported by
the device, the device is set to the slowest rate supported by the device. If the input scan rate
requested is greater than the fastest rate supported by the device, the device is set to the
maximum rate supported by the device.