Serial Communications

The switcher’s rear panel Remote 9-pin D female connector (figure 4-1) can be connected to the RS-232 serial port output of a host device such as a computer running the HyperTerminal utility or a control system. This connection makes software control of the switcher possible.

5

1

Pin

RS-232

Function

1

Not used

 

 

 

 

2

TX

Transmit data

9

6

3

RX

Receive data

4

Not used

Female

 

 

5

Gnd

Signal ground

 

 

6

Not used

 

 

7

Not used

 

 

8

Not used

 

 

9

Not used

Figure 4-1 — Remote connector pin arrangement

The protocol is 9600 baud, 8-bit, 1 stop bit, no parity, and no flow control.

Host-to-Switcher Instructions

The switcher accepts (Simple Instruction Set) SIScommands through the RS-232 port. SIS commands consist of one or more characters per command field. They do not require any special characters to begin or end the command character sequence. Each switcher response to an SIS command ends 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.

Switcher-Initiated Messages

When a power-up occurs, the switcher responds by sending the following message to the host:

Copyright 2005, Extron Electronics, IN1508, Version x.xx

Version x.xx is the firmware version number.

The switcher does not expect a response from the host; but, for example, the host program might request a new status.

Switcher Error Responses

When the switcher receives an SIS command and determines that it is valid, it performs the command and sends a response to the host device. If the switcher is unable to perform the command because the command is invalid or contains invalid parameters, the switcher returns an error response to the host. The error response codes are:

E01 — Invalid input channel number (too large)

E09 — Invalid function number (too large)

E10 — Invalid command

E13 — Invalid value (out of range)

E17 — Invalid command for signal type

4-2 IN1508 Scaling Presentation Switcher • Serial Communications

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Extron electronic IN1508 manual Host-to-Switcher Instructions, Switcher-Initiated Messages, Switcher Error Responses