QUANTUM
™
LX EVAPORATOR CONTROL PANEL
COMMUNICATIONS SETUP
090.610-CS (MAY 2016)
Page 117
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
Com-2 (TB3)
Notice in the gure entitled RS-232 Com-
2 (TB3) Communications Wiring, the only
jumper associated with TB3 Com-2 is jumper
LK11. LK11 must be set to the A position. No-
tice the LED indicators that are pointed out.
D4 LED will ash each time that the Quan-
tum™ transmits (TX) data. D6 LED will ash
each time that data is received (RX).
If communications cannot be established us-
ing TB3, then note the status of these two
LED’s (D4 and D6). If D6 is constantly lit, it
may indicate an external wiring issue (TX and
RX possibly swapped). Also verify the position
of LK11, and ensure that it is in position A.
Also verify that the proper Panel ID, Baud
rate, data bits, and protocol matches that of
the initiating device (see the section entitled
COMMUNICATIONS SETUP for further details).
Com-3 (PL6)
Notice in the gure entitled RS-232 Com-
3 (PL6) Wiring to 9-Pin D-Connector, there
are no jumpers or LED’s associated with PL6
Com-3.
If communications cannot be established us-
ing PL6, verify that the wiring is per the gure
when wired direct from a remote RS-232 port.
Also verify that the proper Panel ID, Baud
rate, data bits, and protocol matches that of
the initiating device (see the section entitled
COMMUNICATIONS SETUP for further details).
TROUBLESHOOTING RS-422
Com-1 (TB1)
Notice that in the table entitled RS-422 Com-1
(TB1) Board Jumpers that there are six jumpers
associated with TB1. NOTE: LK11 must be set to
position B, and LK17 must be set to position A.
Notice also the two LED indicators that are in
the gure. D3 LED will ash each time that the
Quantum™ 4 transmits (TX) data. D2 LED will
ash each time that data is received (RX).
If communications with the Q4 cannot be estab-
lished using TB1, then note the status of these two
LED’s (D2 and D3). If D2 is constantly lit, it may
indicate an external wiring issue (TX and RX pos-
sibly swapped). If D2 never ashes, then the LX is
not receiving any data. If D2 does ash each time a
data bit is received, but D3 never ashes, this may
indicate that the LX has received a data command,
but that the protocol package is not properly for-
matted, and the LX cannot respond.
On the Communications Setup screen, verify that
the proper Panel ID, Baud rate, data bits, and pro-
tocol matches that of the initiating device.
Com-2 (TB2)
Notice that in the table entitled RS-422 Com-2
(TB2) Board Jumpers, there are seven jumpers as-
sociated with TB2. NOTE: LK11 must be set to
position B, and LK17 must be set to position
A. Notice also the two LED indicators that are
pointed out in the gure. D1 LED will ash each
time that the Q4 transmits (TX) data. D6 LED
will ash each time that data is received (RX).
If communications with the Q4 cannot be estab-
lished using TB2, then note the status of these two
LED’s (D1 and D6). If D1 is constantly lit, it may
indicate an external wiring issue (TX and RX pos-
sibly swapped). If D6 never ashes, then the LX is
not receiving any data. If D6 does ash each time a
data bit is received, but D1 never ashes, this may
indicate that the LX has received a data command,
but that the protocol package is not properly for-
matted, and the LX cannot respond.
On the Communications Setup screen, verify that
the proper Panel ID, Baud rate, data bits, and pro-
tocol has been setup, and matches that of the ini-
tiating device.
To Next Page
Loading...
