PIO-D48 Series Card
48-channel OPTO-22 Compatible DIO Board
User Manual/Ver. 3.4/Aug. 2015/PMH-006-34/Page: 12
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
Sec.
6.3.1
for more information related to this). The power-on states are given as follows:
D/I/O operations for each port are disabled.
D/I/O ports are all configured as Digital input ports.
D/O latch register outputs are all high impedance. (Refer to
Sec. 2.6)
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
Sec.6.1
)
Step 2:
Enable all Digital I/O operations. (Refer to
Sec. 6.3.1
).
Step 3:
Configure ports to their expected D/I/O state & send their initial values to every D/O
port (Refer to
Sec. 6.3.7
)
For more information on the initial procedure for digital I/O ports, please refer to the DIO demo
program.