PIO-D96 Series Card
96-channel DIO Board
User Manual, Ver. 2.3, Jun. 2018, PMH-008-23 Page: 13
2.5
Enable I/O Operation
When the PC is first turned on, all operations involved with Digital I/O channels are disabled. Note
that the Digital I/O channel of each port is enabled or disabled by the RESET\ signal, refer to
Section
6.3.1 “REST\ Control Register”
for more information related to this. The power-on states for all
DI/DO ports are given as follows:
DI/DO operations for each port are disabled.
DI/DO ports are all configured as Digital Input ports.
DO latch register outputs are all high impedance. (Refer to
Section 2.6 “DI/DO Architecture”
)
The user has to perform some initialization before using these Digital I/O ports. The recommended
steps are given below:
Step 1:
Find the address-mapping for PIO/PISO cards. (Refer to
Section 6.1 “How to Find the I/O
Address”
)
Step 2:
Enable all Digital I/O operations. (Refer to
Section 6.3.1 “RESET\ Control Register”
).
Step 3:
Configure the first three ports to their expected DI/DO state and send their initial values to
every DO port (Refer to
Section 6.3.7 “I/O Selection Control Register”
)
Step 4:
Configure the other three ports to their expected DI/DO states and send their initial values
to every DO port (Refer to
Section 6.3.7 “I/O Selection Control Register”
)
Note:
For more information on the initial procedure for Digital I/O ports, refer to the DIO demo program.