Component Data; Light Emitting Diodes (Leds); Bsp Led - Daikin MicroTech III Installation And Maintenance Manual

Component Data

The Modbus communication module is a printed circuit board
with a plastic enclosure. It connects directly to the left-hand
side of the MicroTech III chiller unit controller as shown in
Figure 3. It may be possible that another module is also
Figure 3: Modbus Communication Module Attached to Unit Controller
Figure 4 shows the important features of the Modbus
communication module, which are described in the following
section.
Figure 4: Modbus Communication Module
+ - Ref
RS-485 Network
Connector
Channel 0
RS-485 Network
Connector
Channel 1
(Not Used)
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connected to the unit controller. In this case, the Modbus
communication module simply attaches directly to the left side
of the existing module instead of the unit controller.

Light Emitting Diodes (LEDs)

The Modbus communication module has a BSP LED and a
BUS LED to indicate communication activity and status of the
Modbus communication module. These indicators are visible
when the module is connected to the MicroTech III chiller unit
controller and the unit is powered on

BSP LED

The BSP LED indicates the communication state between the
Modbus communication module and the MicroTech III chiller
unit controller.
Table 1: BSP LED Activity
BSP LED Color
Alternating red and
green flashing at once
per second
Green
Yellow
Red flashing with 2Hz
BUS LED
BSP LED
1. In the event that this should occur, cycle power to the unit controller. Contact
the Daikin Applied Controls Customer Support group at 866-462-7829 for
additional assistance if necessary.
5 IM 969-5 • MICROTECH III CHILLER UNIT CONTROLLER
Table 1 describes the status of the BSP LED.
Description
Board Support Package (BSP) firmware upgrade in
progress.
BSP is running. Communication is established
between the unit controller and the communication
module.
The communication module is capable of
communicating to the unit controller. However,
communication is not established.
BSP (software) error.
Red Hardware error.
1
I
nTroduCTIon
(Figure 4).
1