55
JOHNSON CONTROLS
FORM 150.68-ICOM1
ISSUE DATE: 10/15/2020
BACNET, MODBUS AND YORKTALK 2 COMMU
-
NICATIONS
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)
• RS-232: connect to TB3 - Network (RX) to TB3
(TXD); Network (TX) to TB3 (RXD); Network
(GND) to TB3 (GND)
See Figure 1 on page 56 for TB1, TB2 and TB3 loca-
tions.
In most cases, communication parameters will need to
be modified.
ters for the available protocols. Modification is accom-
plished by pressing the PROGRAM, DOWN, DOWN,
DOWN, DOWN, 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 3 on page 57 for error descriptions
Summary of Contents for YLPA 0115SE
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Page 79: ...79 JOHNSON CONTROLS FORM 150 68 ICOM1 ISSUE DATE 10 15 2020 YLPA P I Diagram ...
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