Omega Engineering OMB-1108-0901 用户手册
DaqTemp User’s Manual
09-06-02
Overview & Theory of Operation 1-9
Output Channel Configuration
Analog Output Channels
Each D/A channel can be configured for waveform output individually. If the D/A channel is not
configured for waveform output, it then is available for asynchronous output operations.
configured for waveform output, it then is available for asynchronous output operations.
Synchronous Output Clocking
The DaqTemp Series PCI Boards allow clocking of the synchronized output by the acquisition clock
source, an internal, programmable pacer clock or by an external clock source. When the clock source
generates a new clock signal all outputs are updated concurrently. Regardless of the clock source, the clock
may not exceed the maximum update rate of 100kHz.
source, an internal, programmable pacer clock or by an external clock source. When the clock source
generates a new clock signal all outputs are updated concurrently. Regardless of the clock source, the clock
may not exceed the maximum update rate of 100kHz.
Synchronous Output Data Source
The DaqTemp Series PCI Boards allow the data source for synchronized output operations to be that of a
memory based buffer or a file located on a mass storage medium. With either type of output data source,
the output data for all the channels are contained in the buffer and/or file. The file path may be any file
located on the machine or network accessible file.
memory based buffer or a file located on a mass storage medium. With either type of output data source,
the output data for all the channels are contained in the buffer and/or file. The file path may be any file
located on the machine or network accessible file.
Asynchronous I/O Operations
The DaqTemp Series PCI boards allow asynchronous input of any counter or digital channel that is not
currently configured for synchronous acquisition. The PCI boards for DaqTemp7A and DaqTemp14A also
allow for asynchronous output to any D/A channels that are not currently configured for waveform output.
In addition, the timer outputs can be programmed at any time regardless of the current state of synchronous
or asynchronous operations on other channels.
currently configured for synchronous acquisition. The PCI boards for DaqTemp7A and DaqTemp14A also
allow for asynchronous output to any D/A channels that are not currently configured for waveform output.
In addition, the timer outputs can be programmed at any time regardless of the current state of synchronous
or asynchronous operations on other channels.
Digital I/O Channels
[Local 8255 Channels]
The DaqTemp Series PCI Boards have an Intel 8255 core in the digital I/O logic on the P2 port of the
product. With the Intel 8255 there are three 8-bit wide ports available for I/O and one 8-bit wide port for
configuration purposes. The configuration port is used to configure the other three 8-bit ports for either
input or output operations.
product. With the Intel 8255 there are three 8-bit wide ports available for I/O and one 8-bit wide port for
configuration purposes. The configuration port is used to configure the other three 8-bit ports for either
input or output operations.
Pulse Stream Output Using Timers
The boards allow the generation of output pulses based upon a programmable setting. These output timers
can be set at any time regardless of the state of any synchronous or asynchronous operations which are
currently taking place on other channels.
can be set at any time regardless of the state of any synchronous or asynchronous operations which are
currently taking place on other channels.
Analog Output Channels
The boards that have analog output capabilities have the ability to output analog data to any of the available
(up to four) D/A channels. Each D/A channel may be asynchronously updated by an application if the D/A
channel is not currently being used for waveform output operations.
(up to four) D/A channels. Each D/A channel may be asynchronously updated by an application if the D/A
channel is not currently being used for waveform output operations.
Frequency/Counter Input Channels
The DaqTemp Series PCI boards have counter input capabilities and have the ability to read counter input
[if the counter channel is not configured for synchronous acquisition]. As in the case of synchronous
operations the 4 16-bit counter input channels can be used individually or cascaded into 2 32-bit counter
channels. For either cascaded or non-cascaded counter channels each channel can be configured for:
[if the counter channel is not configured for synchronous acquisition]. As in the case of synchronous
operations the 4 16-bit counter input channels can be used individually or cascaded into 2 32-bit counter
channels. For either cascaded or non-cascaded counter channels each channel can be configured for:
• Clear on Read Mode - specifies that each counter should be cleared (reset to 0) upon being read.
• Continuous Totalize Mode – specifies that each counter is to free-run and not be cleared during
• Continuous Totalize Mode – specifies that each counter is to free-run and not be cleared during
the read operation.