QUANTUM
™
LX EVAPORATOR CONTROL PANEL
COMMUNICATIONS SETUP
090.610-CS (MAY 2016)
Page 108
COMM-2 (P11)
COMM-2 may be used for either RS-422 or RS-
485, depending on the setting of jumper J7. If pins
2-3 are shorted (closed) on J7, then RS-485 is se-
lected.
Notice in the gure entitled RS-422/485 Con-
nectors, Jumpers and LED Location, there are six
jumpers associated with COMM-2. Refer to the ta-
ble entitled RS-422/485 (COMM-1, P10 & COMM-
2, P11) Board Jumpers for the function of each of
the jumpers associated with COMM-2. Notice also
the two LED indicators that are pointed out. D26
LED will ash each time that the Quantum™ trans-
mits (TX) data. D25 LED will ash each time that
data is received (RX).
If communications cannot be established using
COMM-2, then note the status of these two LED’s
(D25 and D26). If D25 is constantly lit, it may indi-
cate an external wiring issue (TX and RX possibly
swapped). Also verify the position of J7, and en-
sure that it is set for pins 1-2 closed.
Also verify that the proper Panel ID, Baud rate,
data bits, and protocol has been setup at the
Quantum™, and matches that of the initiating de-
vice (see the section entitled COMMUNICATIONS
SETUP for further details).
COMM-3 (P16)
Notice that in the gure entitled RS-422/485 Con-
nectors, Jumpers and LED Location, there are no
jumpers associated with COMM-3.
If communications with the Q5 cannot be estab-
lished using COMM-3, then access the Commu-
nications Setup screen, and verify that the proper
Panel ID, Baud rate, data bits, and protocol has
been setup, and matches that of the initiating de-
vice.
COMM-4 (P17)
NOTE: Although COMM-4 is used for RS-485
communications, this port is reserved for the
purpose of communicating to the internal Digi-
tal and Analog boards. It can still be diagnosed
with the following procedure.
Notice that in the gure entitled RS-422/485 Con-
nectors, Jumpers and LED Location, there are no
jumpers associated with COMM-4.
If communications with the Q5 cannot be es-
tablished using COMM-4, then access the About
screen, and verify that all available I/O boards are
shown. If any boards are physically present, yet do
not show on this screen, check to ensure that the
addressing DIP switches for the board(s) is prop-
erly set.
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