Bacnet, Modbus And Yorktalk 2 Communications - York YLAA0285SE Manual

FORM 150.72-NM3 (1020)
ISSUE DATE 10/05/2020

BACNET, MODBUS AND YORKTALK 2 COMMUNICATIONS

Data can be read and in some cases modified using a
serial communication BACnet, Modbus or YorkTalk
2 network connection. This information allows
communications of chiller operating parameters and
external control changes to setpoint, load limiting, and
start/stop commands.
BACnet and YorkTalk 2 RS485 networks are wired to
the + and - terminals of TB1 for port 1 communications.
Modbus network connection has the option of RS232 or
RS485 connection for port 2 communications. Modbus
network is wired to either TB2 or TB3 as follows:
• RS-485: connect to TB2 - Network (-1) to TB2
(-1); Network (+1) to TB2 (+1)
DE MODIFIER ADDRESS
DE MODIFIER OFFSET
P1 PROTOCOL
P1 MANUAL MAC
ADDRESS
P1 BAUD RATE
P1 PARITY
P1 STOP BITS
JOHNSON CONTROLS
• RS-232: connect to TB3 - Network (RX) to TB3
(TXD); Network (TX) to TB3 (RXD); Network
(GND) to TB3 (GND)
Refer to Fig. 64 "Micropanel Connections" for TB1,
TB2 and TB3 locations.
In most cases, communication parameters will need
to be modified. Table 29 "Values Required for BAS
Communication" lists setup parameters for the available
protocols. Modification is accomplished by pressing
the PROGRAM, DOWN ARROW, DOWN ARROW,
DOWN ARROW, DOWN ARROW, and ENTER keys
in sequence. The list below shows the displays for the
values that may be modified:
P2 PROTOCOL
XXXXX
P2 MANUAL MAC
ADDRESS
XX
P2 BAUD RATE
XXXXXX
P2 PARITY
XXX
P2 STOP BITS
XXXXX
P2 HW SELECT BIT
XXXXX
REAL TIME ERROR
RESET 1 = YES, 0 = NO 0
X
Note: See Table 30 for error descriptions
SECTION 10 – MAINTENANCE
XXXXXXXXXX
XXX
XXXXX
XXXXX
X
XXXXX
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