Johnson Controls Frick QUANTUM LX, Setup

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QUANTUM™ LX COMPRESSOR CONTROL PANEL
COMMUNICATIONS SETUP
090.020-CS (APRIL 13)
Page 123
SERIAL COMMUNICATIONS TROUBLESHOOTING
WIRING NOTE: See the chapter entitled Serial Commu-
nications Port Wiring, for the pictorials and tables re-
ferred to in the following paragraphs. Always ensure that
the wiring matches these pictorials before proceeding.
JUMPER NOTE: Some of the jumpers in the previous ta-
bles may need to be modi fi ed for RS-422/485 to ensure
optimum communications performance. Typically, the ter-
mination jumper should be installed in the last Quantum™
in the communications daisy chain only.
TROUBLESHOOTING RS-232
Com-2 (TB3)
Notice in the fi gure entitled RS-232 Com-2 (TB3)
Communications Wiring , the only jumper as-
sociated with TB3 Com-2 is jumper LK11. LK11
must be set to the A position. Notice the LED
indicators that are pointed out. D4 LED will fl ash
each time that the Quantum™ transmits (TX)
data. D6 LED will fl ash each time that data is re-
ceived (RX).
If communications cannot be established using
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 initi-
ating device (see the section entitled COMMU-
NICATIONS SETUP for further details).
Com-3 (PL6)
Notice in the fi gure entitled RS-232 Com-3 (PL6)
Wiring to 9-Pin D-Connector, there are no jump-
ers or LED’s associated with PL6 Com-3.
If communications cannot be established using
PL6, verify that the wiring is per the fi 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 initi-
ating device (see the section entitled COMMU-
NICATIONS 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
fi gure. D3 LED will fl ash each time that the Quan-
tum™ 4 transmits (TX) data. D2 LED will fl 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
possibly swapped). If D2 never fl ashes, then the
LX is not receiving any data. If D2 does fl ash each
time a data bit is received, but D3 never fl ashes,
this may indicate that the LX has received a data
command, but that the protocol package is not
properly formatted, and the LX cannot respond.
On the Communications Setup screen, verify
that the proper Panel ID, Baud rate, data bits,
and protocol matches that of the initiating de-
vice.
Com-2 (TB2)
Notice that in the table entitled RS-422 Com-
2 (TB2) Board Jumpers , there are seven jump-
ers associated 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 fi gure. D1 LED will fl ash each
time that the Q4 transmits (TX) data. D6 LED will
fl 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
possibly swapped). If D6 never fl ashes, then the
LX is not receiving any data. If D6 does fl ash each
time a data bit is received, but D1 never fl ashes,
this may indicate that the LX has received a data
command, but that the protocol package is not
properly formatted, and the LX cannot respond.
On the Communications Setup screen, verify
that the proper Panel ID, Baud rate, data bits,
and protocol has been setup, and matches that
of the initiating device.