Simple Instruction Set Control; Host-To-Switcher Communications; Switcher-Initiated (Unsolicited) Messages; Error Responses - Extron electronics SW2 VGArs User Manual

Remote Control
The SW VGArs / Ars Series switcher's rear panel Remote
connector (figure 4-1) can be connected to the serial port output
of a host device, such as a computer or control system, to an
Extron IR 102 Kit Universal Remote Control, OR to a remote
contact closure device. Other than the IR 102 Kit, remote
communications with the switcher are via the Extron Simple
Instruction Set (SIS ™ ) or under Windows
program; or they can be pin-programmed for use with a contact
closure device.
REMOTE
Figure 4-1 — Remote connector pinout
The RS-232 protocol of the rear panel Remote connector is
9600 baud, 1 stop bit, no parity, and no flow control. The
connector has the pin assignments shown in figure 4-1.
For RS-232 and IR control, use a control cable with only pins 2,
3, and 5 connected. To accomplish this, either cut the wires to
the other pins in hard-shelled connectors, or remove the
unneeded pins from molded plugs.
For contact closure, use a control cable with pins 2 and 3 NOT
connected. To accomplish this, either cut the wires to these pins
in hard-shelled connectors or remove these pins from molded
plugs.

Simple Instruction Set Control

Host-to-switcher communications

SIS commands consist of one or more characters per field. No
special characters are required to begin or end a command
character sequence. When a command is valid, the switcher
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 =
the response character string. A string is one or more
characters.
SW VGArs / Ars Series Switchers • Remote Control
4-2
® -based control
Contact
RS-232 Closure Function
PIN
— In #1 Input #1
1
TX — Transmit data
2
3 RX — Receive data
— In #2 Input #2
4
Gnd Gnd Ground
5
— In #3 Input #3
6
— In #4 Input #4
7
8 — In #5 Input #5
— In #6 Input #6
9
), which signals the end of

Switcher-initiated (unsolicited) messages

When a local event, such as a front panel operation or error
condition, occurs, the switcher responds by sending a message
to the host. The switcher-initiated messages are listed below:
(C) Copyright 2002, Extron Electronics SWy VGArs, Vx.xx
The switcher issues the copyright message when it first powers
on. Vx.xx is the firmware version number.
Inn•All
The switcher issues the Inn message when a front panel input
selection operation occurs. n is the input number.
Reconfig
The switcher initiates this message when there is a change in an
audio model's audio gain setting.
Sig•n•n•n•n•n•n
The switcher initiates this message when there is a change in the
status of an input. n = 1 indicates the video signal is present,
n = 0 indicates the video signal is not present. There are as
many ns in the switcher-initiated message as the maximum
number of inputs for the models (2, 4, or 6). For example, the
response Sig•1•1•1•0•1•0
present on inputs 1, 2, 3, and 5, and that no signal is present on
inputs 4 and 6.

Error responses

When the switcher receives a valid SIS command, it executes the
command and sends a response to the host device. If the
switcher is unable to execute the command because the
command is invalid or it contains invalid parameters, the
switcher returns an error response to the host. The error
response codes are:
E01 — Invalid input channel number (out of range)
E06 — Invalid input channel change (auto-switch mode
active)
E09 — Invalid function (mode) parameter
E10 — Invalid command
E13 — Invalid value (out of range)
E14 — Illegal command for this configuration
SW VGArs / Ars Series Switchers • Remote Control
shows that the input signal is
4-3