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RS-232/Remote Control, cont'd
The CD 900 decoder's rear panel RS-232/Remote connector
(figure 10) can be connected to the serial port output of a host
device, such as a computer or control system, or to a remote
contact closure device. Remote communications with the
CD 900 are via Extron's Simple Instruction Set, Extron's
Windows-based control program, or pin-programmed in the
case of a contact closure device.
5
9
Female
Figure 10 — RS-232/Remote connector pinout
The RS-232 protocol of the rear panel RS-232/Remote connector
is 9600 baud, 1 stop bit, no parity, and no flow control. When
the CD 900 receives an RS-232 communication, the front panel
Min LED blinks once, then the Max LED blinks. (In Executive
mode, the LEDs are on and do not blink.) The connector has the
following pin assignments:
P
n i
R
S
2 -
2 3
C
o
1
—
2
T
X
3
R
X
4
—
5
G
n
d
6
—
7
—
8
—
9
—
Simple Instruction Set Control
Host-to-interface 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 CD 900
executes the command and sends a response to the host device.
All responses from the CD 900 to the host end with a carriage
return and a line feed (CR/LF =
the response character string. A string is one or more characters.
CD 900 Decoder • RS-232/Remote Control
4-2
1
1
5
6
6
9
Male
n
a t
t c
l c
s o
u
e r
F
u
n
t c
o i
n
—
N
t o
u
e s
d
—
T
a r
s n
m
t i
d
a
a t
) - (
—
R
c e
i e
e v
d
a
a t
(
) +
—
N
t o
u
e s
d
G
n
d
S
g i
n
l a
g
o r
u
n
d
n I
1 #
n I
p
t u
1 #
n I
2 #
n I
p
t u
2 #
T
1 #
T
l a
y l
1 #
T
2 #
T
l a
y l
2 #
), which signals the end of
CD 900-initiated messages
When a local event, such as a front panel operation or error
condition, occurs, the CD 900 responds by sending a message to
the host. The CD 900-initiated messages are listed below:
(C) Copyright 1999, Extron Electronics CD 900, Vx.xx
The CD 900 issues the copyright message when it first powers
on. Vx.xx is the firmware version number.
Reconfig
The CD 900 initiates this message when there is a change in the
selected input or any picture control setting.
Factory Defaults Reset on Channel #1
Factory Defaults Reset on Channel #2
RS-232 - Overrun
RS-232 - Noise
RS-232 - Framing
RS-232 - Overflow
These CD 900-initiated message indicate an RS-232
communication error. Possible causes include an RS-232
connection or baud rate problem.
RAM Test Failed
ROM Checksum Failed
Serial EEPROM Checksum failed
6811 EEPROM Checksum failed
New 6811 Installed
New Serial EEPROM Installed
Invalid Jumpers - Unknown - xxxx
If an error occurs during power-up, the CD 900 initiates one or
more of the messages listed above. Call the Extron customer
support hotline.
Error responses
When the CD 900 receives a valid SIS command, it executes the
command and sends a response to the host device. If the
CD 900 is unable to execute the command because the
command is invalid or it contains invalid parameters, the
CD 900 returns an error response to the host. The error response
codes are:
CD 900 Decoder • RS-232/Remote Control
4-3
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