ICP DAS SST-900B User Manual v1.0, 2011/05 Page
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1. Introduction
The SST-900B module is integrated for data acquisition and control
application between a host and remote sensors, and it provides a better
solution for environments where wiring is difficult.
The SST-900B module is a wireless module that works in a frequency
range of 902-928 MHz, and includes adjustable 16 RF channels and each
channel can be allocated one of sixteen group IDs. If data is to be
transferred from one SST-900B module to another, the channel number
and the group ID number must be the same on both modules. Both
RS-232 and RS-485 interfaces are supported, and the module can be
configured to operate in either broadcast or peer-to-peer transmission
mode. All configurations can be completed using the external switches.
Connection interfaces are mutually exclusive, meaning that a
connection to the RS-485 can’t be made when using the RS-232, and
vice versa.
In broadcast mode, all SST-900B modules operate in slave mode, so
they are able to receive transmissions from each other. In peer-to-peer
mode, however, although a multiple number of masters and slaves, exist
also known as a multi-point structure, the master will only receive
transmissions from the slave and vice versa.
