Crown AMB-5 User Manual

Page 12

IQ Mixer / Multiplexer  Hardware Installation

Rev. 0

RS232

RS422

1

2

4

8

16

32

64

128

BAUD RATE PARITY

eters of the mixer/multiplexer and the host computer
must be the same. Any mismatch will prevent com-
munication from taking place.

The communication parameters of the host com-
puter are set by the IQ software. This is true for both
PCs and Macintosh computers. Please refer to the
appropriate software manual for details.

Here are some important guidelines when configur-
ing serial communication:

• Use the same communication 

standard at each

end. If the unit is set for RS232, the computer
must also be set for RS232. (Refer also to the
appropriate IQ software manual.)

• Use the same communication 

parameters at

each end. The unit and the computer must be
set for the same baud rate and parity check-
ing.

• Use the highest baud rate possible but be

aware that 

the communication circuitry (UART)

in some PCs cannot function over 9600 baud.
(IQ mixer/multiplexers can be set as high as
19.2 K baud.)

• If the host computer fails to communicate with

the unit and the communication standard and
parameters are set correctly, try reducing the
baud rate of both the unit and the computer.

• If communication problems persist, check the

serial cable for improper wiring or possible
shorted or broken wires.

• For further assistance call either the Crown

Technical Support Group or Amcron Technical
Services Dept. (see page 22 for telephone
numbers).

The Crown Bus is a serial communication loop de-
signed to transmit IQ commands and data. As a
communication standard it is independent of the
wiring system used. This flexibility is a great
strength, enabling a Crown Bus loop to be wired
with either fiber optic cabling or with inexpensive
twisted-pair wire, whichever the installation re-
quires. A single 

IQ System can have more than one

Crown Bus loop. To function properly, a Crown Bus
loop must be unbroken.

Before installing a mixer/multiplexer

 on a Crown

Bus loop, it must be given a unique IQ address.
This address will be used by the 

IQ System when-

ever it communicates with the unit.

The 8-segment DIP switch shown in Figure 3.5 is
used to set the IQ address. No two IQ components
of the same model which are connected to the same

Fig. 3.5  Selecting the Communication Standard and Parameters