Technical Description
Sealevel Systems
ISO-16
Page
10
Direct Hardware Control
In systems where the users program has direct access to the hardware (DOS)
the table below gives the mapping and functions which the 3094 provides, a
base address of 300 was used. If a different base address is used then the port
addresses are calculated as shown in the table.
Reading the Inputs (direct) :
The inputs are active Low. If no voltage is applied across one of the
differential inputs it returns a one on that bit. If an AC or DC voltage (of
sufficient magnitude, covered above) is applied it returns a zero on that bit.
R = Read
W = Write
R/W = Read or Write
Function
Available
Port
Address Hex
Address
Decimal
Port Type
R
A
300 (Base + 0)
768
Input Port (Opto Input)
R
B
301(Base + 1)
769
Input Port
