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Communication Ports; Building Automation System (bas) Communications; Using Communications Protocol - Quantech QTC4 STYLE A Series Installation Operation & Maintenance

Air-cooled screw liquid chillers with variable speed drive, 150 - 500 tons, 525 - 1750 kw, 2 compressor, 60 hz.
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SECTION 7 - OPERATION

Communication Ports

The 03478 microboard has the following native
communication ports.
TB3 Port 1 Native BAS RS-485.
SW1 RS-485 Biasing Switch for Port. Set to ON if
Chiller is in an End Of Line position on the network.
U26 is the Port 1 RS-485 Driver Chip. It is
socketed to allow field replacement. RX1 and TX1
LEDs illuminate to indicate Port 1 communications
activity.
BUILDING AUTOMATION SYSTEM (BAS)
COMMUNICATIONS
There are three different ways the chiller communi-
cates to the BAS.
• Via board Native Communication protocol
• Using an E-Link Gateway
• Using an SC-EQ Communication Card

Using Communications Protocol

TB3 Port 1 Native BAS RS-485.
SW1 RS-485 Biasing Switch for Port. Set to ON if
chiller is in an End of Line position on the network.
U26 is the Port 1 RS-485 Driver Chip. It is sock-
eted to allow field replacement. RX1 and TX1 LEDs
illuminate to indicate Port 1 communications activity.
QTC4 Native Communication Setup
Native communication is applicable to three types of
protocols, they are BACnet, N2 and Modbus RTU.
It requires IPU II Microboard (331-03478-101) and
software version Y.ACS.20.02 or later.
BACnet MS/TP Setup Port 1 (TB3)
To setup the BACNET MS/TP Port 1, follow the steps
below:
1. Connect the BACnet MS/TP Network to Port 1 on
the IPU II I/O Board.
2. Set up the QTC4 Port 1 (P1) for BACnet
Communications as shown in Figure 18 on Page
99.
100
To access the Port communication parameters:
1. Press the PROGRAM key once.
2. Enter password 5255.
3. Press the (ENTER) key to display the Port 1
(P1) settings.
Set the following parameters:
1. DE Modifier Address (number entered is
multiplied by 100): set as required by network.
2. DE Modifier Offset (number entered is added to
DE Modifier Address): set as required by net-
work (see NOTE below).
3. P1 Protocol: set to BACNET (Default Setting).
4. P1 Manual MAC Address: set to 1
(Default Setting).
5. P1 Baud rate: set as required by network.
If not known, set to AUTO.
6. P1 Parity: set to NONE (Default Setting).
7. P1 Stop Bits: set to 1 (Default Setting).
The BACnet DE Instance (Device Instance) is
determined by adding the [DE MODIFIER AD-
DRESS x 100] with the DE MODIFIER OFFSET. For
example, if the desired DE Instance address is 5023,
set the DE Modifier Address to 50, and then set the
DE Modifier Offset to 23 (50 X 100 + 23 = 5023).
DE Instances must be limited to values between
1 and 4,194,303 and every device in the network must
have a unique device Instance.
N2 Metasys Setup Port 1 (TB3)
1. Connect the N2 Network to Port 1 on the IPU II
I/O Board as shown in Figure 18 on Page 99.
2. Set up the QTC4 Port 1 (P1) for N2 Communica-
tions.
To access the Communication parameters:
You must always cycle power to the
microboard following port setting
changes.
FORM QTC4-NM1
ISSUE DATE: 4/2/2018
QUANTECH

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