Product manual

Installation
26 025-9158L
These modular, 4-conductor connectors are located on the right side of the rear panel (see
Figure 6). They are used to connect up to three expansion panels to the Model 26. These
are unidirectional ports: the LOOP OUT port transmits; the LOOP IN port receives; and
they must always be connected with a half twist cable, even if no expansion panels are
used. If the LOOP OUT port on the Model 26 is not connected to the LOOP IN port,
keyboard inputs from its own buttons will not be detected by the Model 26.
Figure 8: Model 26 Expansion Unit Rear Panel Layout
LOOP OUT
LOOP IN
JP1 - A: PANEL ADDR 1
JP1 - B: PANEL ADDR 2
JP1 – C: PANEL ADDR 3
FUSE: AGC 2 AMP
To connect expansion panels to the Model 26, connect the LOOP OUT port of each unit
to the LOOP IN port of the next unit using 4-conductor, half-twist cables with modular-
type connectors. When finished, a complete circular connection should have been made,
starting at the Model 26 LOOP OUT port and ending up at the Model 26 LOOP IN port.
This connection carries not only the data but also power for each expansion unit. There
are no further connections that need to be made to the expansion panels.
In order for the expansion panels to work they must each have their individual addresses
set by a jumper (JP1) on their rear panels. The first expansion panel will be address A
(JP1 must be set to the A position), the second panel will be address B and a third panel
address C.