GF Signet 4150 Turbidimeter - Manual (Page 12)

12 Signet 4150 Turbidimeter
ENTER
Output Options: Con¿ guring the RS–485 Output
1. Press the ź key. The lower display shows BAUD.
2. Press the Ź key. The upper display will begin blinking.
3. Press the Ÿ and ź keys to scroll to the baud rate required
(1200, 2400, 4800, 9600, or 19200)
4. Press the ENTER key to save the setting.
5. Press the ź key. The lower display shows ADDR (Address).
6. Press the Ź key. The upper display will begin blinking.
7. Press the Ÿ and ź keys to scroll to the correct address.
Address options are from 1 to 255.
8. Press the ENTER key to save the setting.
9. Press the ź key. The lower display shows MBUS.
10. Press the Ź key. The upper display will begin blinking.
11. Press the Ÿ and ź keys to select ASCII or RTU.
12. Press the ENTER key to save the setting.
Press the Ÿ and ź keys simultaneously to exit the OPTIONS
menu and return to normal operation.
RS–485 Default Settings
RS–485 must be selected in order to access this menu function.
The setting of 8 bits, 1 stop bit and no parity are set as default for
the RS–485 port. To change these settings, enable the Extended
Options menu and scroll down the Extended Options to the
menus seen below.
Modbus Serial Communication Protocol
Modbus is a communication protocol based on a multidrop Master/Slave architecture. This technique supports a network of up to 255
slave devices with each device given a unique address.
The transmission protocol used in the 4150 is RS-485, with the unit operating as a slave to a master Modbus device.
The 4150 has two transmission modes: Either ASCII (American Standard Code for Information Interchange) or RTU (Remote Terminal
Unit).
To prevent damage to the instrument, be sure that the 4150 is not powered when connecting the RS-485 line.