NAV SD 501 and NAV SD 101 Scaling Decoders • SIS Operation
64
PRELIMINAR
Y
Host-to-Decoder 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
decoder executes the command and sends a response to the host device. All responses
from the decoder 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.
Decoder-Initiated Power-Up Message
When the decoder completes its start-up, it issues the following message to the host:
©
Copyright
20
yy
,
Extron
Electronics
NAV
SD
n
01
,
V
x
.
xx
,
60
-
nnnn
-
nn
]
(
n
01
=
501
or
101
)
V
x
.
xx
is the firmware version number and
60
-
nnnn
-
nn
is the part number.
Decoder Error Responses
When the decoder receives a valid SIS command, it executes the command and sends a
response to the host device. If the decoder is unable to execute the command because the
command is invalid or it contains invalid parameters, the decoder returns an error response
to the host. The error response codes are:
E10
— Invalid command
E12
— Invalid port number
E13
— Invalid parameter
E14
— Invalid for this port configuration
E17
— Invalid command for signal type
E22
— Busy
E24
— Privilege violation
E25
— Device not present
E28
— Bad file name or file not found
Using the Command and Response Tables
The command and response table begins below. Symbols are used throughout the table
to represent variables in the command and response fields. Command and response
examples are shown throughout the table. The ASCII to HEX conversion table below is for
use with the command and response table.
ASCII to Hex Conversion Table
•
Space
