Johnson Controls YORK Tempo YLAA Series, Installation Operation & Maintenance

Page: 178 / 192

JOHNSON CONTROLS
178
FORM 150.72-NM1 (1020)
Maintenance
BACNET, MODBUS AND YORKTALK 2 COM-
MUNICATIONS
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)
• RS-232: connect to TB3 - Network (RX) to TB3
(TXD); Network (TX) to TB3 (RXD); Network
(GND) to TB3 (GND)
Refer to Fig. 32 “Micro Panel 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:
DE MODIFIER ADDRESS
XXXXX
DE MODIFIER OFFSET
XX
P1 PROTOCOL
XXXXXX
P1 MANUAL MAC
ADDRESS XXX
P1 BAUD RATE
XXXXX
P1 PARITY
XXXXX
P1 STOP BITS
X
P2 PROTOCOL
XXXXXXXXXX
P2 MANUAL MAC
ADDRESS XXX
P2 BAUD RATE
XXXXX
P2 PARITY
XXXXX
P2 STOP BITS
X
P2 HW SELECT BIT
XXXXX
REAL TIME ERROR ##
RESET 1 = YES, 0 = NO 0
Note: See Table 30 for error descriptions