Product manual

Electrical Connections
27
These ports have voltage and current levels which are RS-232 compatible. The following
are the pin descriptions for these two connectors:
Pin/Signal Description
OUT-1 (GND) Connected to Model 26’s chassis ground.
OUT-2 (TX) This is an output and carries the data being transmitted.
OUT-3 (+12VDC) This carries power to the expansion panels.
OUT-4 (GND) Connected to Model 26’s chassis ground.
IN-1 (GND) Connected to Model 26’s chassis ground.
IN-2 (+12VDC) This carries power to the expansion panels.
IN-3 (RX) This is an input and carries the data being received.
IN-4 (GND) Connected to Model 26’s chassis ground.
Multiple Model 26 CHAIN OUT/IN Connectors
These modular, 6-conductor connectors are located on the right side of the rear panel next
to the KEYBOARD EXPANSION connectors. They are used to add multiple Model 26
positions to the system. These ports are bi-directional and do not need to be connected in
loop fashion as the LOOP IN/OUT ports do.
To add additional Model 26 positions to the system, connect the CHAIN IN port of one
Model 26 to the CHAIN OUT port of another using a 6-conductor (one-to-one twisted
pair) cable. Up to 15 Model 26 units can be connected together in this fashion. This port
is a 2-wire type port (EIA 485) and the connection should be less than 1000 feet. The
standard cable used for this connection is a Zetron part number 709-0650, which is 50
feet in length.
Before multiple positions will work properly, they must have:
1. Their addresses set correctly (see
Option Switch Settings on page 23).
2. Their line termination is set properly (see the information about JP6 on page
21).
3. The Number of Positions parameter configured in the Software Configuration
Program (see
System Configuration Menu on page 33).
These ports’ voltages and current levels are RS-485 compatible. The following table
contains the pin descriptions for these two connectors.