The USB-2020 supports the following features.
Functions
UL: cbAIn(), cbAInScan(), cbALoadQueue(), cbATrig(), cbFileAInScan()
UL for .NET: AIn(), AInScan(), ALoadQueue(), ATrig(), FileAInScan()
Python for Windows: a_in(), a_in_scan(), a_load_queue(), a_trig()
Options
BACKGROUND, BLOCKIO, BURSTIO*, CONTINUOUS, EXTCLOCK, EXTTRIGGER**, NOCALIBRATEDATA, RETRIGMODE***, SCALEDATA, SINGLEIO
* The packet size is 64 megasamples, max, when set to BURSTIO.
** For analog triggers, the first channel in the scan is the analog trigger channel.
*** RETRIGMODE is supported for digital trigger types only.
Packet size
Rate-dependent
HighChan
0 to 1
Rate
Up to 8 MS/s; system-dependent.
Up to 20 MS/s with BURSTIO enabled.
Range
| BIP10VOLTS (±10 volts) | BIP2VOLTS (±2 volts) |
| BIP5VOLTS (±5 volts) | BIP1VOLTS (±1 volts) |
Pacing
Hardware pacing, internal clock supported. External clock supported via the CLK IO signal on the BNC connector.
Functions
UL: cbSetTrigger()
UL for .NET: SetTrigger()
Python for Windows: set_trigger()
TrigType
Analog: GateAbove, GateBelow, GateInWindow, GateOutWindow, TrigAbove, TrigBelow, TrigRising, TrigFalling
Digital: GateHigh, GateLow, TrigHigh, TrigLow, TrigPosEdge, TrigNegEdge
Threshold
0 to 4,095
Functions
Python for Windows: d_in(), d_out()
PortNum
AuxPort
DataValue
0 to 255
Functions
UL: cbDBitIn(), cbDBitOut()
UL for .NET: DBitIn(), DBitOut()
Python for Windows: d_bit_in(), d_bit_out()
PortType
AuxPort
BitNum
0 to 7
Functions
No counter functions are supported.
Functions
UL: cbDisableEvent(), cbEnableEvent()
UL for .NET: DisableEvent(), EnableEvent()
Python for Windows: enable_event(), disable_event()
Types
ON_DATA_AVAILABLE, ON_END_OF_INPUT_SCAN
Functions
UL: cbFlashLED()
UL for .NET: FlashLED()
Python for Windows: flash_led()
Causes the LED on a Measurement Computing USB device to blink. When you have several USB devices connected to the computer, use this function to identify a particular device by making its LED blink.
This hardware supports device detection with the API. Refer to the InstaCal, API Detection, or Both? section for information about whether to use InstaCal or the API to detect and configure hardware.
Factory serial number
Listed as Factory Serial No. (read only)
Identifier
Identifier text box
Enable pacer output
Enable pacer output checkbox
Hardware version
Listed as Firmware Version (read only)
Listed as FPGA Version (read only)
Factory serial number
ConfigItem = BIDEVSERIALNUM
UL for .NET: GetDeviceSerialNum()
Python for Windows: get_config_string()
config_item = DEVSERIALNUM
Identifier
UL: cbGetConfigString(), cbSetConfigString()
ConfigItem = BIUSERDEVID
maxConfigLen = up to 64 characters
UL for .Net: GetUserDeviceId(), SetUserDeviceId()
Python for Windows: get_config_string(), set_config_string()
config_item = USERDEVID
max_config_len = up to 64 characters
Enable pacer output
UL: cbGetConfig(), cbSetConfig()
ConfigItem = BIINPUTPACEROUT
UL for .NET: GetInputPacerOut(), SetInputPacerOut()
Python for Windows: get_config(), set_config()
info_type = BOARDINFO
config_item = INPUTPACEROUT
config_val = State enum
Hardware version
ConfigItem = BIDEVVERSION
DevNum = VER_FW_MAIN, VER_FPGA
UL for .NET: GetDeviceVersion()
Type = VersionType.FW_MAIN
Type = VersionType.FW_FPGA
Python for Windows: get_config_string()
config_item = DEVVERSION
dev_num = MAIN
dev_num = FPGA
The channel-gain queue is limited to two elements. The gains may be any valid value. The channels specified must be unique and listed in consecutive order.
When creating very large buffers in Windows, you may receive the message "The requested amount of Windows page-locked memory is not available" when you attempt to start a scan. This occurs when there is enough memory to create the data buffer, but it can't be locked down. If you receive this message, change the data transfer mode from kernel mode to user mode by calling cbSetConfig()/SetAdXferMode() with the following argument values:
InfoType = BOARDINFO
ConfigItem = BIADXFERMODE (Python for Windows: config_item = ADXFERMODE)
ConfigVal = XFER_USER (Python for Windows: config_val = XferModeenum)
Note: When user mode transfer is enabled, all of the enabled events using cbEnableEvent()/EnableEvent()/enable_event() are ignored when an input scan function is called.