Features; Specifications; Dimensions - Daikin MicroTech III Installation And Maintenance Manual

The Modbus communication module connects the
MicroTech III chiller unit controller to a building automation
system (BAS). This interface enables the exchange of Modbus
objects between the unit controller and the network.
The Modbus communication module, together with the unit
controller, support the Modbus RTU standard protocol.

Features

• Integration into a building automation and control system
via Modbus RTU
• Simple attachment to a MicroTech III chiller unit controller
• LEDs that indicate communication status and network
activity
• Network addressing and baud rate set directly from the
unit controller
• Circuit board components enclosed in protective housing

Specifications

The following section provides a summary of technical data
and conformance to agency listings.
General

Dimensions

W × H × D: 1.77 × 4.33 × 2.95 in (45 × 110 × 75 mm)
Weight 3.5 oz (98 g)
Base - plastic, pigeon-blue
Material
Housing - plastic, light-gray
Operating
Temperature -40 – 158°F (-40 – 70°C)
Humidity <90% RH
Min. 10 psi (70kPa), corresponding to max. 9,842 ft
Atmospheric pressure
(3,000 m) above sea level
Storage and Transportation
Temperature -40 – 158°F (-40 – 70°C)
Humidity <95% RH
Min. 3.77 psi (26 kPa), corresponding to max.
Atmospheric pressure
32,808 ft (10,000 m) above sea level
Electrical
Supplied via unit controller
Power
DC 5 V (+5% / -5%), max. 270 mA
RS-485 (EIA-485) - T1 and T2
Network connection
3-wire twisted pair, shielded
Galvanically isolated
+, -, REF (3 wires)
Bus connection/
Transceiver
Isolated transceiver with fail-safe circuitry
1/8 Unit load
Bus termination 680 Ω / 120 Ω +1 nF / 680 Ω (switch by software)
Baud rate 4800, 9600, 19200, and 38400
Additional Components
Board-to-board 10-pin plug between communication module and unit
connector controller
Modbus network
RS-485 connection plug, 3-pin spring cage top entry
connector
Agency Listings
US UL916, UL873
Canada CSA C22.2M205
Europe
EMC directive 2004/108/EC
Low-voltage directive 2006/95/EC Listings
RoHS directive 2002/95/EC
IM 969-5 • MICROTECH III CHILLER UNIT CONTROLLER
Dimensions
Figure 1 and Figure 2 provide key dimensional data.
Figure 1: Modbus Communication Module Top View
Figure 2: Modbus Communication Module Side View
1.77 in (45 mm)
4.33 in (110 mm)
4.57 in (116 mm)
4
I
nTroduCTIon
1.77 in (45 mm)
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