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PVS 305SA • Serial Communication
4-2
Serial Communication
PRELIMINARY
PRELIMINARY
The PVS 305SA switcher can be remotely set up and controlled via a host computer
or other device (such as a control system) attached to the rear panel Control port.
Alternatively, the switcher can be controlled by an MediaLink Controller (MLC)
(connected to the same port) or by an RS-232 device acting through the MLC.
The control device (host) can use either the Extron Simple
Instruction Set (SIS
™
) commands or the Global Configurator
program for Windows. For details on use and setup of
a system that includes a MLC, refer to the MediaLink
Controller user’s manual.
Switcher protocol:
• 9600 baud • 1 stop bit • no parity • no flow control
Control connector pin assignments:
N
Configuration can also be completed by
connecting a 2.5 mm stereo mini cable
(part # 70-335-01) to the 2.5 mm jack (port) on the front panel. This port has
the same protocol as the RS-232 connector on the rear panel.
6 feet
5
1
9
6
Sleeve (Gnd)
Ring
Tip
9-pin D Connection TRS Plug
Pin 2 Computer's RX line Tip
Pin 3 Computer's TX line Ring
Pin 5 Computer's signal ground Sleeve
Figure 3-1 — Pinout diagram for 2.5 mm mini cable TRS plug when
connecting to the front panel Config port
N
Firmware updates can be made only via the front panel Config port.
RS-232 Programmer’s Guide
Host-to-PVS communications
SIS commands consist of one or more characters per field. No special characters are
required to begin or end a command sequence. When the PVS switcher determines
that a command is valid, it executes the command and sends a response to the host
device. All responses from the switcher to the host end with a carriage return and
a line feed (CR/LF = ]), which signals the end of the response character string. A
string is one or more characters.
PVS-initiated messages
When a local event such as a front panel selection or adjustment takes place, the
PVS responds by sending a message to the host. No response is required from the
host. The PVS-initiated messages are listed here (underlined).
© Copyright 2009, Extron Electronics, PVS 305SA, V1.xx
The PVS sends the copyright message when it first powers on. V1.xx is the
firmware version number.
CONTROL
Tx
Rx IR
+12V
A
B
C
ED
(A) Transmit (Tx)
(B) Receive (Rx)
(C) IR in
(E) +12 VDC out
(D) Ground ( )