Oldham WX16, User Manual

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WX16 User Manual | 23
Figure 2.13
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Turning Piezo Alarm ON causes the audible piezo to duplicate the action of the
horn relay. This feature may be used to provide a low-decibel indication of the
status of the system’s horn.
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Alarm 1 & Alarm 2 menus control how this alarm level from each channel will
affect the common horn relay. Choices are OFF , ON or BEEP (one Hz. Pulsating).
As an example, A2 conditions might pulse the horn ( BEEP ) and A1 conditions to
cause a steady horn ( ON ). Any other combination of these 3 choices is possible
for A1 and A2 levels affecting the horn relay. This feature is very useful since it
allows the horn relay to serve as another level A1, level A2 or both for channels 1-
16, 1-8 or 9-16. Individual channel alarms may also be configured to not affect the
Horn relay on a channel by channel basis (see section 2.2.2).
•
Failsafe & Horn Group menu entries are identical to the descriptions for menus
Common Relay 1 & Common Relay 2 in section 2.3.1.
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Turning Acknowledge OFF allows the common Horn relay to drive devices other
than horns or sirens, such as a light or a fan.
•
Display Alm YES forces the LCD to display the Bar Graphs screen upon any new
alarm. This feature is offered to satisfy applications requiring channels in alarm to
be displayed automatically (all channels are displayed on the Bar Graphs screen).
2.3.4 Comm Port Menus
The system Comm Port menu allows setting RTU Slave ID address, Slave Baud rate,
Parity and UART Timer for the comm2 slave ModBus serial port (comm1 master port
ID settings are per channel as described in section 2.2.4). This slave port may be used
to transfer WX16 data to a host device such as a PC, PLC, DCS or even another
WX16. The slave port is addressable, allowing many WX16 controllers to be connected
to a single RS-485 cable. The
UART Timer setting is disabled with 00 seconds
entered. Entering a value causes the comm2 slave ModBus serial port to reinitialize if
no ModBus query is processed within this time period. This ensures against serial port
lockup. Section 5 of this manual provides important information describing how to
interface to the WX16’s ModBus slave port.