
FRICK
®
QUANTUM™ LX AcuAir
®
CONTROL PANEL S90-510 CS (MAR 07)
COMMUNICATIONS SETUP Page 5
SERIAL COMMUNICATIONS
GENERAL DESCRIPTION
Serial communications to and from the Quantum™ LX
can use RS-232, RS-422 and/or RS-485 hardware
protocol. These three hardware protocols can be
connected via Com-1 and Com-2 for RS-422/485, and
Com-2 and Com-3 for RS-232. The reason that Com-
2 can be either RS-232 or RS-422/485 will be
explained in the section entitled Com-1 and Com-2
Description.
The Com-1 and Com-2 serial communications portion
of the Quantum™ controller consists of a daughter
board, mounted to the main controller. In addition to
external forms of serial communication (to be
discussed shortly), the keypad also connects here.
Refer to the following pictorial of the Com-1 and Com-
2 communications daughter board.
Com-3 is another serial port (RS-232) that may be
used in addition to Com-1 and Com-2. The location of
Com-3 is on the main processor board, as shown
below will be explained in the section entitled Com-3
Description.
Com-1, Com-2 and Com-3 Ports
COM-1 AND COM-2 DESCRIPTION
The board pictured above actually has three
serial communications ports (labeled as TB1,
TB2 and TB3). TB1 is known as Com-1, and is
reserved solely for RS-422/485 communications.
It can be used for external communications to the
outside world.
TB2 is known as Com-2. However, TB3 is also
known as Com-2. The difference here is that TB2
is for RS-422/485 whereas TB3 is for RS-232.
TB2 can be used in the same manner as TB1.
When TB2 (Com-2) is setup to be used for RS-
422/485, then TB3 cannot be used for RS-232, and
vice-versa. The reason for this is that there is a
jumper (LK11) that needs to be properly set that will
tell the controller which of the two ports will be used
(either TB2 as RS-422/285 OR TB3 as RS-232).
COM-3 DESCRIPTION
Com-3 (PL6) is used for RS-232 hardware
protocol only, and can be used in addition to any
of the other communications ports that may be
being used. So it is possible to have two RS-232
ports active (Com-2 AND Com-3) at the same
time, as well as Com-1 for RS-422/485.
PL6
Com-3
RS-232
TB1
Com-1
RS-422/485
TB2
Com-2
RS-422/485
TB3
Com-2
RS-232