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SECTION 8 - MICROPANEL
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 commu-
nications 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 communica-
tions. Modbus network connection has the option of
RS232 or RS485 connection for port 2 communica-
tions. 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)
300
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
• RS-232: connect to TB3 - Network (RX) to TB3
(TXD); Network (TX) to TB3 (RXD); Network
(GND) to TB3 (GND)
Refer to Figure 60 on page 301 "Control Board Con-
nections" for TB1, and TB2 locations.
In most cases, communication parameters will need to
be modified. Table 26 on page 302 "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
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 27 for error descriptions
FORM 201.23-NM2
ISSUE DATE: 3/9/2015
JOHNSON CONTROLS
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