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090.040-CS (JAN 14)
Page 112
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 modified 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-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 indicators 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 position 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 table 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™ transmits (TX) data. D25 LED will
flash each time that data is received (RX).
QUANTUM™ HD COMPRESSOR CONTROL PANEL
COMMUNICATIONS SETUP
If communications cannot be established us-
ing COMM-2, then note the status of these two
LED's (D25 and D26). If D25 is constantly lit, it
may indicate an external wiring issue (TX and RX
possibly swapped). Also verify the position of J7,
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).
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 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 indicators 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 position of J1,
and ensure that it is set for pins 2-3 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 2-3 are shorted (closed) on J7, then RS-485
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 table 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™ transmits (TX) data. D25 LED will
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