Table of Contents
Advertisement
Section 8 - Micropanel
Figure 146 - Control board connections
The Chiller Control Board contains a dual UART for
RS-485 and RS-232 communications. UART1 is dedi-
cated to RCC and ISN communications over an RS-
485 link. UART2 is dedicated to internal communica-
tions within the chiller. The RS-485 port is configured
for 4800 baud, 1 start bit, 8 data bits, odd parity, and 1
stop bit.
Table 50 - Minimum, maximum and default values
DESCRIPTION
DE MODIFIER ADDRESS
DE MODIFIER OFFSET
P1 BAUD RATE
P2 BAUD RATE
P1, P2 MANUAL Mac AD-
DRESS
P1, P2 PARITY
P1 PROTOCOL
P2 PROTOCOL
P1, P2 STOP BITS
RESET REAL TIME ERROR
296
MINIMUM
-1
-1
1200
1200, 4800, 9600, 19200, 38400, 76800, AUTO SELECTABLE
1200
1200, 4800, 9600, 19200, 38400, 57600 SELECTABLE
-1
NONE
NONE, EVEN, ODD, IGNORE SELECTABLE
BACNET
BACNET, API SELECTABLE
TERMINAL
TERMINAL, MODBUS IO, MODBUS SERVER, API, MODBUS CLIENT SELECTABLE
1
NO
Connections for ISN communications are on the Chiller
Control Board on TB1/TB2. TB2 on the Microgateway
is utilized for ISN comms connection. P3 is RS485+,
P2 is RS485-, and USHL is the shield.
The table below shows the minimum, maximum, and
default values.
MAXIMUM
41943
99
76800
57600
127
IGNORE
API
MODBUS CLIENT
2
YES
Form 201.23-NM2
Issue date: 12/19/2023
LD10637
DEFAULT
-1
-1
4800
1200
-1
NONE
BACNET
API
1
NO
Johnson Controls
Advertisement
Table of Contents
