Serial Communication
The PVS 204SA 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
(GC2) program for Windows. For details on use and setup
of a system that includes a MediaLink Controller, refer to the MediaLink Controller user’s manual.
Switcher protocol:
•9600 baud • 1 stop bit • no parity • no flow control
RS-232/MLC/IR connector pin assignments:
NConfiguration can also be completed by connecting a 2.5 mm stereo mini cable (part #
(A)Transmit (Tx) 
(B)Receive (Rx)
(C)IR in
(D)Ground ( 
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(E)+12 VDC out
PRELIMINARY
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1 | 6 |
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5 | 9 |
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| Tip | |
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| Ring |
| Connection | TRS Plug | Sleeve (Gnd) | |
| Pin 2 | Computer's RX line | Tip |
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| Pin 3 | Computer's TX line | Ring |
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| Pin 5 Computer's signal ground | Sleeve |
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Figure 4-1 — Pin out diagram for 2.5 mm mini cable TRS plug when connecting to the front panel Config port
NFirmware 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
© Copyright 2006, Extron Electronics, PVS 204SA, V1.xx Chn x
The PVS sends the copyright messages when it first powers on. V1.xx is the firmware version number.
Chn X! ] (where X! is the input number)
The PVS sends this response when an input is switched.