JOHNSON CONTROLS
142
FORM 100.50-NOM12
ISSUE DATE: 04/02/2019
SECTION 6 – USER INTERFACE CONTROL CENTER
The software version number is shown in the follow-
ing format:
C.ECO.ZZ.YY (control board released version),
where:
• C = the product classification and stands for
commercial unit
• ECO = the family code and stands for
YORK
®
70–105 ton rooftop unit air condi-
tioner control panel
• ZZ = the product code
• YY = the version number
CONNECTING BAS TO A ROOFTOP UNIT WITH
THE IPU BOARD
A rooftop unit with an IPU board ships from the fac-
tory ready to connect and communicate with a Build-
ing Automation System (BAS) utilizing BACnet MS/
TP protocol.
The unit can also communicate via BACnet IP, LON,
or N2 with the addition of a field provided/installed
component.
COMMUNICATION
The IPU board is designed to communicate with a
Building Automation System and a printer.
The Building Automation System communication uses
BACnet protocol, MS/TP, Modbus I/O, Modbus Serv-
er, Modbus Client or Terminal. Other Building Auto-
mation system networks can be connected by using a
router.
The printer communication uses ASCII protocol and
RS-232 hardware.
Communication Ports
The IPU Control board has four serial communication
ports. BACnet MS/TP must use Port 1 and Terminal
must use Port 2, which is the RS232 Port. Other proto-
cols may be selected on Ports 3 or 4.
BACnet Wiring
All BACnet devices are “daisy chained” together using
a twisted pair, the (+) is connected to the (+) and the
(-) to the (-). Do not connect wiring to terminals 1, 2
or 5. The connections on the PORT 1 connector are as
follows:
1 - 5V
2 - Ground
3 - Receive (-)
4 - Transmit (+)
5 - Open
PORT 4 (J3)
PORT 2 (J5)
PORT 3 (J2)
MAC ADDRESS SWITCH
NOT USED
SW1
LD11197C
FIGURE 60 - IPU CONTROL BOARD
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