Pin
Assignment
1
Ground
2
CTS+ (HSI+)
3
RTS+ (HSO+)
4
RXD+
5
RXD-
6
CTS- (HSI-)
7
RTS- (HSO-)
8
TXD+
9
TXD-
To set the I/O serial port from port 1 to port 2, see
Setting the I/O serial port to RS485
on page 29.
If you need a two-wire RS485 after setting the I/O port to serial port 2, Hewlett Packard Enterprise
recommends that you use an external USB-to-RS485 adapter. For more information and examples for
validating the MODBUS protocol communication, see
Validating the MODBUS protocol
communication
on page 31.
RS485-solar sensor pin assignments
Pin
RS485 pin assignment
Solar sensor pin assignment
Orange
Data-/B
CAN high
Brown
Data+/A
CAN low
Black
Supply (negative)
Supply (negative)
Red
Supply (positive)
Supply (positive)
Black (thick)
Shield
Shield
Gateway-solar sensor connector pin assignments
Pin
Gateway pin assignment
RS485 pin assignment
RS485 pin color
4
RXD+
Data+/A
Brown
5
RXD-
Data-/B
Orange
8
TXD+
Data+/A
Brown
9
TXD-
Data-/B
Orange
8
RS485-solar sensor pin assignments
