QUANTUM
™
LX EVAPORATOR CONTROL PANEL
COMMUNICATIONS SETUP
090.610-CS (MAY 2016)
Page 107
SERIAL COMMUNICATIONS TROUBLESHOOTING
WIRING NOTE: See the chapter entitled Serial Com-
munications Port Wiring, for the pictorials and tables
referred to in the following paragraphs. Always ensure
that the wiring matches these pictorials before pro-
ceeding.
JUMPER NOTE: Some of the jumpers in the previous
tables may need to be modied for RS-422/485 to en-
sure optimum communications performance. Typically,
the termination jumper should be installed in the last
Quantum™ in the communications daisy chain only.
TROUBLESHOOTING RS-232
The Q5 does not use RS-232.
TROUBLESHOOTING RS-422
COMM-1 (P10)
COMM-1 may be used for either RS-422 or
RS-485, depending on the setting of jumper
J1. If pins 1-2 are shorted (closed) on J1, then
RS-422 is selected.
Notice in the gure entitled RS-422/485 Con-
nectors, Jumpers and LED Location, there are
six jumpers associated with COMM-1. Refer
to the table entitled RS-422/485 (COMM-1,
P10 & COMM-2, P11) Board Jumpers for the
function of each of the jumpers associated
with COMM-1. Notice also the two LED indi-
cators that are pointed out. D8 LED will ash
each time that the Quantum™ transmits (TX)
data. D9 LED will ash each time that data is
received (RX).
If communications cannot be established us-
ing COMM-1, then note the status of these
two LED’s (D8 and D9). If D8 is constantly lit,
it may indicate an external wiring issue (TX
and RX possibly swapped). Also verify the po-
sition of J1, and ensure 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
device (see the section entitled COMMUNICA-
TIONS SETUP for further details).
COMM-2 (P11)
COMM-2 may be used for either RS-422 or
RS-485, depending on the setting of jumper
J7. If pins 1-2 are shorted (closed) on J7, then
RS-422 is selected.
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).
TROUBLESHOOTING RS-485
COMM-1 (P10)
COMM-1 may be used for either RS-422 or RS-
485, depending on the setting of jumper J1. If pins
2-3 are shorted (closed) on J1, 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-1. 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-1. Notice also
the two LED indicators that are pointed out. D8
LED will ash each time that the Quantum™ trans-
mits (TX) data. D9 LED will ash each time that
data is received (RX).
If communications cannot be established using
COMM-1, then note the status of these two LED’s
(D8 and D9). If D8 is constantly lit, it may indi-
cate an external wiring issue (TX and RX possibly
swapped). Also verify the position of J1, 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).
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