
MPX 423 A • Installation
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Amplifier
Projector
Plasma Monitor
VCR (4)
DVD (4)
PC (2)
Laptop (2)
Speakers
Extron
MPX 423 A
Media Presentation
Matrix
TCP/IP
Network
Figure 2-4 — MPX 423 A installation example
RS-232 and Ethernet Control
For RS-232 control, use a control cable with only pins 2, 3, and 5 connected.
Otherwise, either cut the wires to the other pins in hard-shelled connectors or
remove the unneeded pins from molded plugs. See chapter 5, Programmer’s Guide,
for definitions of the SIS commands and details on how to install and use the
control software.
The cable used to connect the RS-232 port to a computer or control system may
need to be modified by removing pins or cutting wires. If unneeded pins are
connected, communication may not be possible.
The RS-232 connector is a DB9 female with the following pin designations:
Pin RS-232 Description
1 — not used
2 Tx Transmit data
3 Rx Receive data
4 — not used
5 Gnd Signal ground
6 — not used
7 — not used
8 — not used
9 — not used
The protocol is 9600 baud, 8-bit, 1 stop bit, no parity, and no flow control. The MPX
423 A is also compatible with the following baud rates: 19200, 38400, and 115200.
DB9 Pin Locations
Female
51
96
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