Digital I/O - Omega ISA- BUS MULTI-FUNCTIONAL BOARD OME-A822PG Hardware Manual

2.5 Digital I/O

The OME-A-822PGL/PGH provides 16 digital input channels and 16
digital output channels. All levels are TTL compatible. The connection
diagram and block diagram are given below:
Output Latch Register
Base+D
D0..D7
Power on
reset
Base+E
Output Latch Register
Input Buffer Register
Base+6
D0..D7
Base+7
Input Buffer Register
Latch
D0..D7
Reset
Reset
D8..D15
Latch
OME-A-822PGL/PGH
OME-A-822PGL/PGH
Read
D0..D7
D8..D15
Read
OME-A-822PGL/PGH Hardware Manual ---- 25
CN2
1..8
17..18
DGND
9..16
CN1
1..8
17..18
DGND
9..16
TTL
DI
DGND
External
Device
TTL
DO
DGND
External
Device