The USB-1208LS 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()
Options
BACKGROUND, BLOCKIO*, BURSTIO**, CONTINUOUS, EXTTRIGGER, NOCALIBRATEDATA
*The packet size is based on the Options setting. When set to BLOCKIO, the packet size is 64 samples.
** BURSTIO can only be used with the number of samples (Count) set equal to the size of the FIFO or less. The USB-1208LS FIFO holds 4096 samples. BURSTIO cannot be used with the CONTINUOUS option.
HighChan
0 to 7 in single-ended mode
0 to 3 in differential mode
Count
In CONTINUOUS mode, Count must be an integer multiple of the packet size.
8000 Hz maximum for BURSTIO mode.
The maximum rate is 1200 Hz for all other modes.
When using cbAInScan() or AInScan(), the minimum sample rate is 100 Hz.
Range
Single-ended:
| BIP10VOLTS (±10 volts) |
Differential
| BIP20VOLTS (±20 volts) | BIP2PT5VOLTS (±2.5 volts) |
| BIP10VOLTS (±10 volts) | BIP2VOLTS (±2 volts) |
| BIP5VOLTS (±5 volts) | BIP1PT25VOLTS (±1.25 volts) |
| BIP4VOLTS (±4 volts) | BIP1VOLTS (±1 volts) |
Functions
UL: cbSetTrigger()
UL for .NET: SetTrigger()
Python for Windows: set_trigger()
TrigType
TRIGHIGH, TRIGLOW
External digital (TTL) hardware triggering is supported. Use the TRIG_IN input (pin # 18 on the screw terminal) for the external trigger signal.
Functions
UL: cbAOut(), cbVOut(), cbAOutScan()
UL for .NET: AOut(), VOut(), AOutScan()
Python for Windows: a_out(), v_out(), a_out_scan()
Options
All settings are ignored
HighChan
0 to 1
Count
(HighChan - LowChan) + 1
Rate
All settings are ignored
Range
Ignore - Not programmable; fixed at UNI5VOLTS (0 to 5 volts)
DataValue
0 to 1023
Functions
UL: cbDConfigPort()
UL for .NET: DConfigPort()
Python for Windows: d_config_port()
PortNum
FIRSTPORTA, FIRSTPORTB
Functions
Python for Windows: d_in(), d_out()
PortNum
FIRSTPORTA, FIRSTPORTB
DataValue
0 to 255 for FIRSTPORTA or FIRSTPORTB
Functions
UL: cbDBitIn(), cbDBitOut()
UL for .NET: DBitIn(), DBitOut()
Python for Windows: d_bit_in(), d_bit_out()
PortType
FIRSTPORTA
BitNum
0 to 15 for on FIRSTPORTA
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() can handle.
**cbCLoad()/cbCLoad32(), CLoad()/CLoad32(), and c_load()/c_load32() only accept Count=0. These functions are used to reset the counter.
CounterNum
1
Count
232-1 when reading the counter.
0 when loading the counter.
cbCLoad() and cbCLoad32()/CLoad() and CLoad32() are only used to reset the counter for this device to 0. No other values are valid.
The Basic signed integers guidelines 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
LOADREG1
Functions
UL: cbEnableEvent(), cbDisableEvent()
UL for .NET: EnableEvent(), DisableEvent()
Python for Windows: enable_event(), disable_event()
Event types
ON_SCAN_ERROR (analog input), 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 USB 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
Input mode
Input Mode drop-down combo box for single-ended or differential.
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: cbGetConfig()
ConfigItem = BIUSERDEVIDNUM
UL for .Net: GetUserDeviceIdNum()
Python for Windows: get_config()
config_item = USERDEVIDNUM
Input mode
UL: cbAInputMode()
UL for .NET: AInputMode()
Python for Windows: a_input_mode
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
When using cbALoadQueue()/ALoadQueue(), the channel gain queue is limited to eight elements.
BURSTIO mode allows higher sampling rates for sample counts up to the size of the FIFO. The USB-1208LS FIFO holds 4096 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() and GetStatus() 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.
The USB-1208LS uses BURSTIO as the default mode for non-CONTINUOUS fast scans with sample counts up to the size of the FIFO (4096 samples). BURSTIO mode allows higher sampling rates for sample counts up to the size of the FIFO. Maximum Rate values of non-BURSTIO scans are limited (refer to the Rate option above). To avoid the BURSTIO default, specify BLOCKIO mode.
When configured for single-ended mode, the resolution of the data is 11 bits (data values between 0 and 2,047). However, the Universal Library maps this data to 12-bit values, so the range of data is no different from the differential configuration. Consequently, the data returned contains only even numbers between 0 and 4,094 when the NOCALIBRATEDATA option is used.
When running an analog input scan with the CONTINUOUS option, set the total number of samples to be an integer multiple of the packet size and the number of channels in the scan. This ensures that the data is aligned properly in the array.
Concurrent operations are not allowed. If you invoke a function while another function is already running on the device, the ALREADYACTIVE error is returned.
When you include both analog output channels in cbAOutScan()/AOutScan(), the two channels are updated simultaneously.