Integra Xmart MODBUS Reference Manual
MODBUS RS-485 CARD
REFERENCE MANUAL
ENGLISH
1.- Introduction
MODBUS card is designed to be installed in SNMP port of all of our Online UPS. This card
is able to provide communication for the UPS under following protocol:
- Implements MODBUS RTU protocol
- Provides MODBUS functions including read holding register and write registers.
- Provides RS232 & RS485 interface
2.- Product Description
1. RS-485 port
2. RS-485/RS232 port
3. Connector to the UPS
4. Address switch
3. Installation
1. Configure Modbus ID (according to section 4)
2. Configure communication format (according to section 4)
3. Configure RS-485 (according to section 4)
4. Insert Modbus card into the intelligent slot in the UPS (/according to figure 1)
5. Connect AC input to the UPS
6. Connect Modbus card to the computer (an external converter could be necessary)
5. Communication setting
6. Resistance switch
7. Jumpers
MODBUS RS-485 CARD
REFERENCE MANUAL
Figure 1: Remove slot cover & Insert Modbus card into the slot
4. Configuration
4.1. Configure Modbus ID:
Configure using SW1:
Switch down = ON = 1.
Switch up = OFF = 0.
First bit is in the right switch.
4.2. Configure Communication format:
Configure using switches from 1 to 4 in SW2
Function Bit Setting Configuration
Baud rate
Parity
check
# 1 # 2
OFF OFF 2400bps
OFF ON 4800bps
ON OFF 9600bps
ON ON 19200bps
# 4 # 3
OFF OFF Even parity
OFF ON Odd parity
ON OFF
ON ON
No parity check
1 stop bits
No parity check
2 stop bits
1
2
MODBUS RS-485 CARD
REFERENCE MANUAL
4.3. Interface Pin-out:
LEFT RIGHT
Pin Function Pin Function
4 RS-485-B 1 TXD to PC
5 RS-485-A 2 RXD from PC
8 GND 4 RS-485-B
5 RS-485-A
6 GND
4.4. Select Communication Type:
Select RS232 or RS-485 by configuring jumpers JP3 and JP4 as below figure.
MODBUS RS-485 CARD
5. Mode Setting
SERIAL COMMUNICATION:
For using serial communication with multiple RS485 cards, external converter must be used.
There are 2 types: (1) RS485 to RS232 converter or (2) RS485 to Modbus/TCP converter as
indicated in below figures. This converters are not included with this RS485 card.
RS485 to RS232 converter:
RS485 to TCP (LAN) converter:
REFERENCE MANUAL
For selecting RS-485 connect jumpers caps between 2-3 in JP3 and JP4
For selecting RS-232 connect jumpers caps between 1-2 in JP3 and JP4
Configuration for Serial Communication:
PARALLEL COMMUNICATION:
Configuration for Parallel Communication:
3
4
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