Extron Electronics SW4 3G HD-SDI User Guide - Manual (Page 26)

SW4 3G HD-SDI • Serial Communication
Serial Communication
3-2
Setting Up RS-232 Communication
The SW4 3G HD-SDI switcher can be configured and controlled
by SIS (Simple Instruction Set) commands via the switcher’s
RS-232 port. This port is used to connect the switcher to a host
or external controlling device, such as a computer or control
system, that can generate the proper command codes and
recognize the switcher’s responses.
Wire the RS-232 connector as shown below.
Switcher
Receiv
e
Tr
ansmit Ground
RS-232
Tx Rx
DB9 connector (female)
pinout to control equipment
Computer
5 1
9 6
Pin RS-232 Function
1 —
2 RX Receive data (+)
3 TX Transmit data (–)
4 —
5 Gnd Signal ground
6 —
7 — —
8 — —
9 — —
—
—
—
RS-232 connector wiring
The serial port has the following RS-232 protocol:
• 9600 baud
• 1 stop bit
• No parity
• 8 data bits
Using Simple Instruction Set (SIS) Commands
Host-to-switcher communications
The Extron Simple Instruction Set (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 = ]), which signals the end of the response character
string. A string is one or more characters.