Oldham WX16, User Manual

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WX16 User Manual | 61
7.2.1 Radio Status Alarms - Wireless Receiver
Mode
When an WX16 channel’s INPUT DATA FROM menu is set for WIRELESS RF900 , in
addition to processing the OLCT 200’s 10-bit “counts” value, it also receives status bits
indicating
Communications Error, Low Battery and Calibration .
•
Communications Error – Each channel’s 30-minute trend screens (Figure
7.4) are very useful for diagnosing wireless problems, since they indicate
amount of time since the most recent transmission was received. The down
arrow on top of the trend screen resets to far right each time a transmission is
received by that channel. When not in alarm, OLCT 200’s transmit each 5
minutes, so the arrow should never progress past the 5-minute interval. The
WX16 activates the channel’s FAULT alarm and indicates
ComErr if no
transmission has been received in 18 consecutive minutes.
•
Low Battery status indicates the OLCT 200’s integral 3.6V lithium D cell (part
#10-0293) has dropped to below 3.3V and should be replaced very soon.
LoBatt is indicated on the WX16’s LCD readout and the Alarm 3 LED flashes.
Relays are not energized by low battery conditions. The actual battery voltage
of each OLCT 200 may be seen in the
INPUT DATA FROM screen described
above in section 7.2.
•
Calibrations performed at the OLCT 200 force a transmission of 75 counts
(negative 15.62%) which may be indicated on the WX16’s LCD readout by In
Cal by using the “Marker Menu” described in section 2.2.4b. Alarms are
inhibited while the “Marker Value” of -15.62% is activated.
Figure 7.4
7.3 Wireless ModBus Slave Mode
Wireless MODBUS allows one or many WX16s to function as wireless ModBus slaves
by connecting their RS-485 ModBus slave ports to a radio modem. These wireless
networks require a ModBus master such as a DCS, HMI or another WX16 Sixteen
Channel Controller; also equipped with a radio modem. As in all WX-series wireless
networks, one transceiver must be designated as Server and all others as Clients. No