Extron electronic SW4 3G HD-SDI user manual Serial Communication, Setting Up RS-232 Communication

Serial Communication

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.

SwitcherComputer

RS-232	5	1
Tx Rx

Ground

Transmit

Receive

9 6

DB9 connector (female)

pinout to control equipment

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.

3-2 SW4 3G HD-SDI • Serial Communication