Stationary Photoionization Detector SPID2
User Manual
SPID2 - User Manual (en) - 1.11.docx
Analytical Control Instruments GmbH, Volmerstraße 9A, D-12489 BERLIN, Germany, www.aci-berlin.de
Version 1.11
Page 31 of 60
6.4.
RS485 (MODBUS)
The device provides a RS485 (MODBUS) interface. This bus makes it possible to connect up to 32
devices including the host system to one line. For proper operation of the bus system, the first and the
last device in chain must be terminated. The MODBUS protocol implementation provides ASCII and
RTU modus and can be configured in the instrument menu.
How To
–
Configure RS485 (MODBUS)
1.
Go to the Instrument Menu and select MODBUS
2.
Select “change” to con
figure RS485 (MODBUS) interface
Select SLAVE ID
•
Up to 127 IDs are possible
Select BAUDRATE
•
9600; 19200; 38400; 57600; 115200
Select MODE
•
Select ASCII or RTU Mode
Select TERMINATION
•
Select build in line termination resistor (120 Ohm)
Default Settings:
•
Slave ID:
010
•
Baud rate:
115200
•
Mode:
RTU
•
Termination:
Enable
•
Parity:
Even (fixed)
