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 modified 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 figure 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 flash
each time that the Quantum™ transmits (TX)
data. D9 LED will flash 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 figure 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 flash each time that the Quantum™ trans-
mits (TX) data. D25 LED will flash 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 figure 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 flash each time that the Quantum™ trans-
mits (TX) data. D9 LED will flash 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).
Summary of Contents for QUANTUM LX Control Panel
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