Clinton DC-1, Инструкция по эксплуатации, Страница: 41 / 58

Models DC-1, -10, -20B DC Spark Testers
DC-1, -10, -20B Instruction Manual – Page 40
RS-485 Interface
The 9-Pin D-Subminiature connector for the RS-485 Multi-Drop Full Duplex
Interface port is located on the back of the spark tester. It is labeled RS-485. The
spark tester can receive commands and requests from a computer or PLC through
this port.
The RS-485 Port uses a standard Modbus RTU communication protocol. For
Parameter Addresses see
the section entitled “ Field Bus Parameter Address ”.
RS-485 Connector
The pin configuration for the RS-485 port is listed in the table below.
Pin # Name
1 TX-
2 TX+
3 RX-
4 RX+
5 GND
6 NC
7 NC
8 NC
9 NC
RS-485 Parameters
The default parameters of for the RS-485 Serial port as listed below. To change
the port address or the baud rate see the Configuration Menu Options. Note if
the unit is being controlled directly from the RS-485 port on the back panel, the
PLC will need to poll REMOTE ENABLE (location 5) at least every 500ms to keep
the unit from turning off the voltage.
The default Parameters are listed in the table below.
Parameter Default Value
Baud Rate 19,200
Data Bits 8
Stop Bits 1
Parity None
Flow Control None
Station Number 10