The USB-7202 supports the following features.
Functions
UL: cbAIn(), cbAInScan(), cbALoadQueue()*, cbFileAInScan(), cbATrig()
UL for .NET: AIn(), AInScan(), ALoadQueue()*, FileAInScan(), ATrig()
Python for Windows: a_in(), a_in_scan(), a_load_queue()*, a_trig()
*The channel-gain queue is limited to eight elements. The channels specified in the queue must be contiguous and in increasing order, except when wrapping around from channel 7 to channel 0. The gains may be any valid value.
Options
BACKGROUND, BLOCKIO*, SINGLEIO*, BURSTIO**, CONTINUOUS, EXTTRIGGER, NOCALIBRATEDATA, EXTCLOCK, HIGHRESRATE
* The packet size is based on the Options setting: When set to BLOCKIO, the packet size is 31 samples. When set to SINGLEIO, the packet size equals the number of channels being sampled.
** BURSTIO can only be used with the number of samples (Count) set equal to the size of the FIFO or less. The USB-7202 FIFO holds 32,768 samples. BURSTIO cannot be used with the CONTINUOUS option.
Mode
Single-ended
HighChan
0 to 7 in single-ended mode
In BURSTIO mode, Count must be an integer multiple of the number of channels in the scan:
200 kilohertz (kHz) maximum for BURSTIO mode (50 kHz for any one channel).
The maximum rate is 100 kHz for all other modes (50 kHz for any one channel).
When using cbAInScan() or AInScan(), the minimum sample rate is 1 Hz. In BURSTIO mode, the minimum sample rate is 20 Hz/channel.
Range
| BIP10VOLTS (±10 volts) | BIP2VOLTS (±2 volts) |
| BIP5VOLTS (±5 volts) | BIP1VOLTS (±1 volts) |
Pacing
Hardware pacing, internal clock supported. External clock supported via the SYNC pin.
Functions
UL: cbSetTrigger()
UL for .NET: SetTrigger()
Python for Windows: set_trigger()
TrigType
Digital triggering: TRIGPOSEDGE, TRIGNEGEDGE
External digital (TTL) hardware triggering supported. Set the hardware trigger source with the Trig_In input.
Functions
UL: cbDConfigBit(), cbDConfigPort()
UL for .NET: DConfigBit(), DConfigPort()
Python for Windows: d_config_bit(), d_config_port()
PortNum
AUXPORT
PortType
AUXPORT
Functions
Python for Windows: d_in(), d_out()
PortNum
AUXPORT (eight bits, bit-configurable)
DataValue
0 to 255 for AUXPORT
Functions
UL: cbDBitIn(), cbDBitOut()
UL for .NET: DBitIn(), DBitOut()
Python for Windows: d_bit_in(), d_bit_out()
PortType
AUXPORT
BitNum
0 to 7 on AUXPORT
Functions
UL: cbCClear(), cbCIn(), cbCIn32(), cbCLoad(), cbCLoad32()**
UL for .NET: CClear(), CIn(), CIn32(), CLoad(), CLoad32()**
Python for Windows: c_clear(), c_in(), c_in_32(), c_load(), c_load_32()
Although cbCIn()/CIn()/c_in() are valid for use with this counter, cbCIn32()/CIn32()/c_in_32() may be more appropriate, since the values returned may be greater than the data types used by cbCIn() and CIn()/c_in_32() can handle.
cbCLoad()/cbCLoad32(), CLoad()/CLoad32(), and c_load()/c_load32() only accept Count=0. These functions are used to reset the counter.
The counter on this device is zero-based.
CounterNum
1
Count
232–1 when reading the counter.
LoadValue
0 when loading the counter.
cbCLoad() and cbCLoad32() / CLoad() and CLoad32() are only used to reset the counter to 0. No other values are valid.
The Basic signed integers guidelines in the Digital Input/Output Hardware topic apply when using cbCIn() or CIn() for values greater than 32,767 and when using cbCIn32() or CIn32() for values greater than 2,147,483,647.
RegNum
LOADREG0
Functions
UL: cbEnableEvent(), cbDisableEvent()
UL for .NET: EnableEvent(), DisableEvent()
Python for Windows: enable_event(), disable_event()
Event types
ON_SCAN_ERROR, 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 USB device to blink. When you have several devices connected, use this function to identify a particular device.
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 SYNC output
Enable SYNC output checkbox
Hardware version
Listed as Firmware 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 SYNC output
UL: cbGetConfig(), cbSetConfig()
InfoType = BOARDINFO
ConfigItem = BIINPUTPACEROUT
UL for .NET: GetInputPacerOut(), SetInputPacerOut()
Python for Windows: get_config(), set_config()
info_type = BOARDINFO
config_item = INPUTPACEROUT
config_val = State enum. When enabled, the input clock is set for output.
Python for Windows: get_config(), set_config()
config_item = INPUTPACEROUT
config_val = State enum
Hardware version
ConfigItem = BIDEVVERSION
DevNum = VER_FW_MAIN
UL for .NET: GetDeviceVersion()
Type = VersionType.FW_MAIN
Python for Windows: get_config_string()
config_item = DEVVERSION
dev_num = MAIN
Since the maximum data acquisition rate depends on the system connected to the device, it is possible to "lose" data points when scanning at higher rates. If the requested speed cannot be sustained, an OVERRUN error will occur.
When running an analog input scan with the CONTINUOUS option, consider the packet size and the number of channels being scanned. In order to keep the data aligned properly in the array, make the total number of samples an integer multiple of the packet size and the number of channels.
You can set the SYNC pin as a pacer input or output. By default, this pin is set for pacer input. If set for output when using the cbAInScan()AInScan()/a_in_scan() EXTCLOCK scan option, a BADOPTION error occurs.
BURSTIO mode allows higher sampling rates for sample counts up to the size of the FIFO. The USB-7202 device's FIFO holds 32,768 samples. Data is collected into the device's local FIFO. Data transfers to the PC don't occur until the scan completes. For BACKGROUND scans, the Count and Index returned by cbGetStatus()/GetStatus()/get_status() remain 0, and Status = RUNNING until the scan finishes. The Count and Index are not updated until the scan is completed. When the scan is complete and the data is retrieved, cbGetStatus() and GetStatus() are updated to the current Count and Index, and Status = IDLE.
BURSTIO is required for aggregate Rate settings above 100 kHz, but Count is limited to sample counts up to the size of the FIFO (32,768 samples). Count settings must be an integer multiple of the number of channels in the scan.