Table 21: Values Required For Bas Communication - York YLAA0041 Installation Operation & Maintenance

Section 7: Unit controls
The table below shows set-up requirements for each
communication protocol.

Table 21: Values Required for BAS Communication

Setting description
De modifier address
De modifier offset
P1 protocol
P1 manual MAC address
P1 baud rate
P1 parity
P1 stop bits
P2 protocol
P2 manual MAC address
P2 baud rate
P2 parity
P2 stop bits
P2 HW select bit
Reset real time error
P1 hw select bit
Chiller ID
1. As required by network. 2. Or other as required by network. 3. Number is multiplied by 100, set as required by network.
4. Number is added to de modifier address, set as required by network.
5. Unit operating software version C.Mmc.13.03 or later required for Modbus Protocol.
6. Unit operating software version 04 (C.MMC.13.04, C.MMC.14.04, or C.MMC.16.04) or higher required for N2 protocol functionality.
BACnet and Modbus communications
Chiller data that can be read and modified using spe-
cific BACnet or Modbus Register Addresses; and the
data associated with the addresses, is outlined in the
following description:
Analog write points
This data can be read and modified using a BACnet
or Modbus network connection. The Modbus Register
Address for these points is 1025 + AV #.
Binary write points
This data can be read and modified using a BACnet
or Modbus network connection. The Modbus Register
Address for these points is 1537 + BV #.
172
BACnet MS/TP
0 to 41943
3
0 to 99
4
BACNET
0-127
1
9600 To 76800 or
Auto Selectable
1
NONE
1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Analog read only points
This data can be read using a BACnet or Modbus net-
work connection and can NOT be modified using this
connection. The Modbus Register Address for these
points is 513 + AI #.
Binary monitor only points
This data can be read using a BACnet or Modbus net-
work connection and can NOT be modified using this
connection. The Modbus Register Address for these
points is 1281 + BI #.
See Table 22 on page 173 for complete list of BACnet
and Modbus registers.
Protocol
Modbus RTU YorkTalk 2
5
1 -1
0 N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
N/A N/A
MODBUS SVR N/A
0-127 N/A
1
19,200 N/A
2
NONE N/A
2
1 N/A
RS-485 or
N/A
RS-232
1
N/A N/A
N/A N/A
N/A 0
Go to the Johnson Controls Chillers
Knowledge Exchange website for the
most up-to-date SC-EQ BAS point maps:
https://docs.johnsoncontrols.com/chill-
ers/. You can also contact your local
Johnson Controls office for a copy of the
data map.
Form 150.72-ICOM6
Issue date: 12/19/2023
N2
6
0 to 41943
3
0 to 99
4
9n2
0-127
1
9600
NONE
1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Johnson Controls