York YK-EP Operation And Maintenance Manual page 263

Figure 91: Microboard serial data communication ports
CR42 CR41
R G
TX1 RX1
MICRO
CR36 CR39
R G
TX4 RX4
CR37 CR40
R G
TX2 RX2
CR46 CR48
R G
TX6 RX6
UART
CR15 CR38 CR35
R R G G
TX3 RX3
CR43 CR44
R G
TX5 RX5
YK-EP Style B Centrifugal Chiller
COM 1
RS-232
COM 4B
+12V
COM 2
(-)
RS-485
(+)
+12V
COM 6
(-)
RS-485
(+)
+24VDC
+12VDC
-12VDC
COM 3
RS-485
GND
OPTO-COUPLE
TX
RX
COM 5
COMMON
RS-232
J2
TX
4
RX
PRINTER
3
DTR
5
DSR
2
GTX
7
GRX
6
SC-EQ
1
Communication Card
GND
8
J13
1
PRIMARY MOTOR CONTROLLER
2
MODBUS PROTOCOL
-
MV VSD, MV SSS, VSD,
3
GND
STYLE B LCSSS
4
TB2
1
ECONOMIZER MTR CONTROLLER
2
MODBUS PROTOCOL
3
STYLE B LCSSS
GND
4
J12
1
LTC I/O BOARD
2
HOT GAS BYPASS
3
HEAT RECOVERY
-
4
HEAD PRESSURE CONTROL
+
5
MOTOR MONITORING
6
J15
1
YORK PROTOCOL-
2
VSD ADAPTIVE CAPACITY
3
CONTROL BOARD OR
4
STYLE B LCSSS
5
6
LD22061
263