PowerWalker Modbus Card 2 User Manual
Modbus Card Quick Guide V.2.5
Thank you for purchasing Modbus Card. This manual contains instructions and warnings that
should be followed during the installation, operating and storage of the card. Please keep this
manual for further reference.
Special Precautions
If the card must be stored prior to installation; storage must be in a dry place
The admissible storage temperature range is from -10ºC to +70ºC.
1. Product Overview
RS-485 port
Golden finger
Address switch
Communication setting
Resistance switch
2. Product Introduction
The Modbus card provides UPS and PV inverter systems with the functionality of communication
with PCs through MODBUS protocol:
Implements MODBUS RTU protocol
Provides MODBUS functions including read Holding Registers and write Registers.
Provides RS485 interface
Provides surge protection
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Modbus Card Quick Guide V.2.5
Function
Bit Setting
Meaning
Baud
rate
# 2
# 1
OFF
OFF
2400bps
OFF
ON
4800bps
ON
OFF
9600bps
ON
ON
19200bps(default)
Parity
check
# 4
# 3
OFF
OFF
Even parity
ON
OFF
Odd parity
OFF
ON
No parity check 1 stop bits
(Default)
ON
ON
No parity check 2 stop bits
There are eight bits to present ID of each card.
Use SW1 to set machine ID. From left to right, it’s
8 to 1. As shown, when the switch is pushed
down, the bit is set to “one”. Otherwise, the bit is
set as zero. The ID of modbus card is set to 0x01
as chart. Please check appendix for detailed ID no.
and SW1 setting.
3. Installation and Operation
Follow below steps to install and use this modbus card:
1. Configure Modbus ID (Refer to section 4.1 for the details)
2. Configure communication format (Refer to section 4.2 for the details)
3. Insert this modbus card into intelligent slot
4. Connect modbus card to computer with RJ45 cable, and it is not necessary to turn the UPS
or PV inverter off. (Refer to section 4.5 for the details)
4. Configuration
4.1 Machine ID Configuration
4.2 Communication Format Configuration
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Modbus Card Quick Guide V.2.5
Pin
Function
4
RS-485 - B
5
RS-485 - A
8
GND
Function
Bit #
Setting
Meaning
Push up
resistance
# 6
ON
Enable (Default)
OFF
Disable
Push down
resistance
# 7
ON
Enable (Default)
OFF
Disable
Terminate
resistance
# 8
ON
Enable (Default)
OFF
Disable
4.3 RS-485 Resistance Configuration
4.4 Interface Configuration
RS-485 Pin Configuration
4.5 Connection
First, please use one RS485 to RS 232 converter or RS-485 to Modbus/TCP converter as media
converter between Modbus card and computer. Please follow below chart for wiring connection
between RJ45 and media converter:
Wiring connection between RJ45 and media converter
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