Hach-lange SC 200 Modbus Module User Manual Instrukcja Użytkownika Pobierz pdf (Strona 9)

Setup the network

1. Select Network setup from the Settings menu.

2. Select the network configuration settings. The network configuration

settings are specific to each individual facility.

Option Description

Edit name Edits the name for the Modbus module

Modbus

address

Selection of the Modbus address

Baud rate The Baud rate—Rate (bits per second) at which the data is

transmitted across the network. All devices on a network must

be set to the same Baud rate. The desired setting will depend

on the physical layout of the network. Degrees of speed

options—9600, 19200 (Default setting), 38.4K, 57.6K, 115.2K

Modbus

mode

Modbus mode—RTU (Default setting) or ASCII

Data order Little Endian (Default setting)—The low-order byte of the

number is stored in memory at the lowest address and the

high-order byte is stored at the highest address. Example:

4 byte LongInt

Byte3, Byte2, Byte1, Byte0

Big Endian—The high-order byte of the number is stored in

memory at the lowest address and the low-order byte is stored

at the highest address. Example: LongInt can be stored as:

Base Address+0 Byte3

Base Address+1 Byte2

Base Address+2 Byte1

Base Address+3 Byte0

Parity Byte by byte error check on RS232/RS485 communication—

None (Default setting), Even, Odd

Option Description

Stop bits Stop bit options—1 (Default setting) or 2

Diag/Test Network timing—The maximum time for the Modbus card to

respond to a request from the Modbus Master (external

system). Select the following options and use the arrows to

enter the values in seconds or use the default setting:

• Read timeout: Reading registers (Default setting: 1 sec)

• Reg write timeout: Writing registers (Default setting: 3 sec)

• File write timeout: Writing a block of data to a file (Default

setting: 5 sec)

• File prep timeout: After a request from the Modbus Master

to open the file, the system needs preparation time to read

the data from the file or to write the data to the file. (Default

setting: 6 sec)

Modbus stats—Statistics of successful and failed Modbus

requests—Good cnt or Error cnt

Clear stats—Deletes the counted messages

Module information—Software version, bootloader version

and serial number.

Set defaults—Sets all user-configured settings to the factory

default settings.

Sensor information

Refer to the sensor manual for sensor register lists. In addition, sensor

information can be downloaded from http://www.hach.com (or

http://www.hach-lange.com). Search Modbus registers or go to the

controller product page.

Troubleshooting

Sensor data type and data length are important. A warning is shown if

incomplete data types or addresses outside the Modbus profile of the

sensor are requested.

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