Q4 CONTROLLER II Operation and Maintenance Manual
Q4 Controller II Operation Manual
- 15 -
Dec 02, 2021
85350-101-000 Rev A
6. Keypad and Menu
All database programming and configuration can be done through the front panel keypad,
although this is practical only for short programs and program modifications. The following
discussion and flow charts demonstrate the operation and menu pathways. In practice you will
find that it is easier to use the keypad and menus than it is to read the reference descriptions. The
menus provide prompting at each stage, and only a few rules need be memorized.
Sensor TX, RX:
When the digital sensors are connected to the Q4 Controller, the traffic of the
communication can be monitored visually through the two RS-485 indicators. One is RX LED,
which indicates the data stream replied from digital sensor and received in the Q4 Controller. The
other is TX LED, which indicates the data stream sent out of the Q4 Controller to the digital
sensors.
Master TX, RX:
When the Q4 Controller is connected to a Modbus device or BAC-Box, the
traffic of the communication can be monitored visually through the two RS-485 indicators.
Note:
If the TX LED or the RX LED is always ON, that means the communication
has a problem. See Troubleshooting for RS-485.
Relay1-4 LED:
Indicate the status of each relay. When the relay is actuated/closed, the Relay
LED is ON. When the relay is de-actuated/open, the relay LED is OFF.
Note:
If you set the relay to be Normally Energized Relay (Fail Safe), the relay LED
will turn ON at non-alarm state and turn OFF at alarm state, because the
LED reflects the relay coil status.
