Building Automation System (Bas) Communications; Using Communications Protocol - York YVAA Installation, Operation & Maintenance Instructions Manual

SECTION 7 - OPERATION
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
socketed to allow field replacement. RX1 and TX1 LEDs
illuminate to indicate Port 1 communications activity.
YVAA 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 YVAA Port 1 (P1) for BACnet Com-
munications as shown in Figure 19 on page 105.
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): as required by network
(see 8).
3. P1 Protocol: set to BACNET (Default Setting).
4. P1 Manual MAC Address: set to 1
(Default Setting).
106
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).
8. 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.
Reboot required (cycle power) after
settings are changed.
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 19 on page 105.
2. Set up the YVAA Port 1 (P1) for N2 Communica-
tions.
To access the Communication parameters:
1. Press the PROGRAM key once
2. Enter password 5255
3. Press (ENTER) to display the Port 1 (P1)
settings.
Set the following parameters:
1. DE Modifier Address: N/A
2. DE Modifier Offset; N/A
3. P1 Protocol : Set to N2
4. P1 Manual MAC Address: Set to 0-127 as
required by the parameters set in the BAS
network.
5. P1 Baud Rate : 9600
6. P1 Parity: None (Default Setting)
7. P1 Stop Bits1: (Default Setting)
FORM 201.28-NM1.1
ISSUE DATE: 1/31/2018
JOHNSON CONTROLS