Oldham WX16, User Manual

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WX16 User Manual | 58
SECTION 7
7.0 Adding The “Wireless” Radio Kit Option
WX16 master / slave serial ports may be connected to a FHSS (Frequency Hopping
Spread Spectrum) wireless radio modem shown in Figure 7.1. There are two different
frequency options offered, 900 MHz and 2.4 GHz. 900 MHz is available in a single port
modem (10-0364) or dual port modem (10-0365). 2.4 GHz is also available in a single
port (10-0357) or dual port modem (10-0358). The dual port radio modems have two
radio modules installed and can be used to receive and transmit data simultaneously.
The radio kit options allow three separate modes of wireless operation. These are
“Wireless Receiver” (section 7.2) accepting data from OLCT 200 sensor transmitters,
“Wireless ModBus Slave” (section 7.3) providing data to a ModBus
master ( master
side of network requires additional radio), and “Wireless ModBus Master” (section 7.4)
accepting wireless data from ModBus
slaves ( slaves side of network requires
additional radio). “Wireless Receiver” and “Wireless ModBus Master” modes require
the radio be connected to the WX16’s RS-485
master port and “Wireless ModBus
Slave” mode connects it to the RS-485 slave port (Figure 3.1). It is important to
remember RADIO SETUP functions described in section 7.1 may only be performed
with the radio connected to the
master port.
Each transceiver on a wireless network must have its RADIO SETUP menus
configured to share the same hopping channel (0-32) and System ID (0-255) to
communicate. All WX-series wireless transceivers utilize a Server-Client network
where Clients synchronize their hopping to the Server. The Server transmits a beacon
at the beginning of every hop (50 times per second). Client transceivers listen for this
beacon, and upon hearing it, will indicate
InRange with the LED on the radio modem
board and synchronize their hopping with the Server. Each network should consist of
only one Server. There should never be two servers on the same RF Channel number
in the same coverage area, as the interference between the two servers will severely
hinder RF communications. The Server must be in a powered location (as opposed to
a battery-powered OLCT 200 utilizing a “sleep” mode) and Servers typically should be
centrally located since all Clients must receive the beacon in order to communicate.