Crestron st-com Manual Do Utilizador
RS-232/422/485 COM Module
Crestron ST-COM
ST-COM Symbol Input Descriptions
INPUT(S)
FUNCTION(S)
[tx$]
More advanced signal processing can be done through serial strings
and the tx$ input line on the symbol.
and the tx$ input line on the symbol.
[enable]
If signal is present on this input, it must be high to permit activity of
the the symbol. If the signal is low, the symbol is disabled.
the the symbol. If the signal is low, the symbol is disabled.
[break]
Some devices use a break character before sending out any serial
data. Break characters are sent out the port separated by the
specified pace parameter.
data. Break characters are sent out the port separated by the
specified pace parameter.
[rts]
RTS is an output from the program to the ST-COM port that sets the
state of the RTS line.
state of the RTS line.
str1
The ST-COM ports are capable of receiving complex serial data in
the form of serial data strings on this input line.
the form of serial data strings on this input line.
ST-COM Symbol Output Descriptions
OUTPUT(S)
FUNCTION(S)
[rx$]
More advanced signal processing can be done through serial strings
and the rx$ output line on the symbol.
and the rx$ output line on the symbol.
[cts]
CTS is an input to the program that monitors the "Clear to Send" line
status of the particular ST-COM port.
status of the particular ST-COM port.
str2
The ST-COM ports are capable of sending complex serial data in the
form of serial data strings on this output line.
form of serial data strings on this output line.
NOTE: When present, the delimiter is appended to every string of text in the port
definition (both transmitted and received strings).
definition (both transmitted and received strings).
Example Program
An example program can be obtained from the Downloads page (EXAMPLES
Library) of the Crestron website (
Library) of the Crestron website (
. Search for ST-COM.SMW.
New users are required to register in order to obtain access to the FTP site.
This example program illustrates serial control of Zone 1 in a lighting system. The
lighting system communicates with port A of the ST-COM over RS-422 with 38400
N81 settings. Zone 1 can either be turned ON or OFF or can be ramped UP or down.
This example program is designed expecting that the only serial input for Zone 1 are
those in the COM port definition of the ST-COM.
lighting system communicates with port A of the ST-COM over RS-422 with 38400
N81 settings. Zone 1 can either be turned ON or OFF or can be ramped UP or down.
This example program is designed expecting that the only serial input for Zone 1 are
those in the COM port definition of the ST-COM.
To turn the lights on, 9 bytes are sent (\x02Z-01-ON\x03). When join #1 on the
touchpanel is pressed, the signal "Lights-Z1-On" goes high. When this signal goes
high, the data is sent out the port to the lighting system. A similar approach is taken
for "Lights-Z1-Off". These buttons have true feedback from the lighting system (i.e.,
when the 16 bytes (\x02Z-01-STATUS-ON\x03) enter the port, the digital signal
"Lights-Z1-On-F" goes high and drives the feedback of join #1 high). In turn, this
lights the feedback for the OFF button on the panel.
touchpanel is pressed, the signal "Lights-Z1-On" goes high. When this signal goes
high, the data is sent out the port to the lighting system. A similar approach is taken
for "Lights-Z1-Off". These buttons have true feedback from the lighting system (i.e.,
when the 16 bytes (\x02Z-01-STATUS-ON\x03) enter the port, the digital signal
"Lights-Z1-On-F" goes high and drives the feedback of join #1 high). In turn, this
lights the feedback for the OFF button on the panel.
In order to ramp the zone, the appropriate command is sent to start the ramping
operation when the UP or DOWN button is pressed. When either button is released,
the output of the NOR gate goes high. This, in turn, sends the STOP command to the
lighting system, telling it to halt the ramping operation in progress.
operation when the UP or DOWN button is pressed. When either button is released,
the output of the NOR gate goes high. This, in turn, sends the STOP command to the
lighting system, telling it to halt the ramping operation in progress.
It is important to note that the user does not have to define the [tx$] or [rx$] for the
port. If strings are being triggered and matched only in the port, the string
port. If strings are being triggered and matched only in the port, the string
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• RS-232/422/485 COM Module: ST-COM
Operations Guide - DOC. 5695A