Table C-1 Pio-32 Series Register Map Summary - Keithley PIO-32 User Manual

Table C-1. PIO-32 Series Register Map Summary
Base 8255 Port
+0h Port A
+1h Port B
+2h Port C (not used)
+3h Control Register (fixed)
+4h Port A
+5h Port B
+6h Port C (not used)
+7h Control Register (fixed)
C-2
Table C-1 summarizes the PIO-32 Series register maps.
Table C-2 lists the register map for the PIO-32I/O board; Table C-3 lists
the register map for the PIO-32IN board; and Table C-4 lists the register
map for the PIO-32OUT board.
In each table, the abbreviation BA is for the Base Address.
Notes:
For input port bits:
For output port bits:
PIO-32IN PIO-32OUT
Read Readback/Write
Read Readback/Write
N/A N/A
N/A N/A
Read Readback/Write
Read Readback/Write
N/A N/A
N/A N/A
0 = no current through optoisolator,
1 = current > 1.25mA (voltage > 3.5V)
0 = relay is not activated (open)
1 = relay is activated (closed
PIO-32I/O
Read
Read
N/A
N/A
Readback/Write
Readback/Write
N/A
N/A
Register Maps