8000-1785-01, Rev. B1
AD2081 Port Expander Installation & Operating Instructions 3
The illustration to the right shows four AD
keyboards and the AD1024 system CPU
connected to the AD2081 Port Expander.
Regardless of the distance between units,
keyboard connections to the AD2081 must
be made through an eight pin wall-mount
terminal block. Pins 1 and 8 of the terminal
block connect to a wall transformer that
provides power to the keyboards.
For distances of seven feet or less,
connections between the AD2081 and the
system CPU can be made directly with a
single, eight conductor, modular cable.
All connections shown in the illustration
assume a distance of greater than seven
feet between the units. In this case, two
terminal blocks must be used to
accommodate the connections. The
recommended cable to connect between
terminal blocks is Belden 8770, 18 AWG, 3
wire shielded cable or equivalent.
The AD1024 CPU is shown in this
illustration. However, the connections
indicated are also valid for hook up to the
AD2150, AD168, and MP48 systems.
1
2
3
4
5
6
7
8
9
10
7 foot modular cable
TERMINAL
BLOCK
2 4 5
TERMINAL
BLOCK
7 5 4
TERMINAL
BLOCK
2 4 5
TERMINAL
BLOCK
7 5 4
TERMINAL
BLOCK
2 4 5
TERMINAL
BLOCK
7 5 4
TERMINAL
BLOCK
2 4 5
TERMINAL
BLOCK
7 5 4
DATA LINE
1 2
PGM MON
PORTS
A
B
C
D
TO CPU
DATA
BAUD
RATE
AD1024 CPU
1676B KEYBOARD
2078A KEYBOARD
2079 KEYBOARD
2088
KEYBOARD
3 wire, shielded
Belden cable or equivalent
8 pin terminal block
1
2
3
4
5
6
7
8
9
10
8-12V
TERMINAL
BLOCK
4 5 7
5 4 7
TERMINAL
BLOCK
AD2081 PORT EXPANDER
KEYBOARD
Typical System Connections
AD2081 Port Expander to AD1024 System Keyboards
