| xPC Target | |
The PCI-DUAL-AC5 has two 8255 chips (1,2). Each chip has three ports (A,B,C). Each port has a maximum of 8 digital I/O lines that can be configured as inputs or outputs.
Use a separate diver block for each port. By selecting the digital input driver block, the port is configured as input.
Scaling Input to Output
| Hardware Input |
Block Output Data Type |
Scaling |
| TTL |
double |
TTL low = 0.0 TTL high = 1.0 |
Driver Block Parameters
Channel vector -- Enter numbers between 1 and 8 to select the digital input lines used with this port. This driver allows the selection of individual digital input lines in any order. The number of elements defines the number of digital lines used.
For example, to use all of the digital inputs for one port, enter
Number the lines beginning with 1 even if the board manufacturer starts numbering the lines with 0.
Port -- From the list choose either A, B, or C. The I/O board has two 8255 chips with 3 ports. The Port parameter defines which port of the 8255 chip is used for this driver block. Each port has a maximum or 8 digital lines that can be configured as inputs or outputs depending on which driver block is chosen. In each case, one block is needed for each port.
Chip -- From the list choose 1 or 2. The Chip parameter defines which of the two 8255 chips is used.
Sample time -- Enter a base sample time or a multiple of the base sample time.
PCI Slot (-1:autosearch) -- Enter a number between -1 and n. If only one board of this type is physically present in the target PC, enter
If two or more boards of this type are physically present in the target PC, enter the bus number and the PCI slot number of the board associated with this driver block. Use the format [BusNumber, SlotNumber]. To determine the bus number and the PCI slot number, type
| | PCI-DUAL-AC5 | PCI-DUAL-AC5 Digital Output | |