Crestron
ST-COM
RS-232/422/485 COM Module
ST-COM Indicators
There are 10 LED indicators located on the front panel of the ST-COM. Refer to
illustration below and descriptions that follow.
ST-COM Indicators
PWR (Power)
This LED illuminates when 12 volts (from power pack) or 24 volts DC (from
network) is supplied to the ST-COM.
NET
This LED illuminates when communication between the ST-COM and either the
SmarTouch STS or Cresnet system is established. Illumination indicates that the
SIMPL program currently loaded has a network device defined at the same NET ID
as the ST-COM.
RXD (COM A / B)
These LEDs flash when the ST-COM receives data from the serial device attached to
the respective COM ports.
TXD (COM A / B)
These LEDs flash when the ST-COM transmits data to the serial device attached to
the respective COM ports.
RTS (COM A / B)
If RTS/CTS handshaking is enabled, these LEDs illuminate when the ST-COM is
ready to receive transmission of data from a serial device attached to the respective
COM ports.
CTS (COM A / B)
These LEDs illuminate when the serial device on the respective COM port is ready
to accept transmission of data from the ST-COM. This “Clear to Send” signal is
available only if RTS/CTS handshaking is enabled; signal is controlled by external
serial device. If CTS signal is not connected (in cable), the signal is held high and the
LEDs are extinguished.
Leading Specifications
The table on the next page provides a summary of leading specifications for the
ST-COM module. Dimensions and weight are approximations rounded to the nearest
hundredth unit.
Operations Guide - DOC. 5695A
RS-232/422/485 COM Module: ST-COM
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