Extron-electronics MLA-VC10 Manual do Utilizador descarregar pdf (Página 42)

MLA-VC10 • Conﬁguration and Operation

Conﬁguration and Operation, cont’d

3-14

RS-232 control

The RS-232 protocol for the MLA-VC10 is 9600 baud, 1 stop bit,

no parity, and no ﬂow control.

The control device (host) can use Extron Simple Instruction Set

(SIS) commands.

The MLA has a 5-pole captive screw connector for

connecting to the MLC and power. The connector

has the following pin assignments:

A = Transmit, B = Receive, C = Not Used,

= Ground, + = +12 VDC input

Host-to-MLA communications

SIS commands consist of one or more characters per ﬁeld. No

special characters are required to begin or end a command

sequence. When a command is valid, the MLA executes

that command and sends a response to the host device. All

responses from the interface 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.

MLA-initiated messages

When the MLA is powered up, it sends the following message

(underlined here) to the host:

]

No response is required from the host. The MLA may also send

a message of Volxxx, where xxx represents the setting for the

percentage of maximum volume.

Error response

When the MLA receives a valid SIS command, it executes the

command and sends a response to the host device. If the MLA is

unable to execute the command because the command contains

invalid parameters, it returns the following error response to the

host:

E13 − Invalid value (the number is out of range/too large)

A B C

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Extron-electronics MLA-VC10 Manual do Utilizador Página 42