3-16 | Model 933S UV Analyzer
If using the Remote Service Port (RS-485), you must configure it for
Full-Duplex (4-Wire) or Half-Duplex (2-Wire) – see “Remote Service Port
RS-485, Full/Half Duplex” below, and Figures 3-4/3-5.
The RS-485 Remote Service Port can also be used for customer ser-
vice, but not at the same time as the RS-232 Communications Port.
Remote Service Port RS-485, Full/Half Duplex
(Service RS-485 JP304)
To congure Set jumper JP304 to
the analyzer for: this position:
Full-Duplex (4-Wire) 1-2
Half-Duplex (2-Wire) 2-3
The Customer Data Acquisition Port (Modbus Communication) is ac-
cessed via J302 on the Host Controller (Lower Enclosure). This line can be
configured as Full-Duplex (4-Wire) or Half-Duplex (2-Wire) – see “Cus-
tomer Data Acquisition Port RS-485, Full/Half Duplex” below, and Figures
3-4/3-5.
If your system is configured to communicate through the RS-485
Customer Data Acquisition Port (Modbus Communication), you
cannot communicate with the analyzer through the RS-232 Com-
munications Port unless you stop polling from the Customer Data
Acquisition Port.
Customer Data Acquisition Port RS-485, Full/Half Duplex
(Customer RS-485 JP303)
To congure Set jumper JP303 to
the analyzer for: this position:
Full-Duplex (4-Wire) 1-2
Half-Duplex (2-Wire) 2-3
If it is possible to do so during installation, cable the terminal connections
into a nonhazardous area. Ensure that all unused cable/conduit entries to
the enclosures are closed with appropriately certified plugs for the haz-
ardous area.
Use a soft, nonabrasive cloth to gently clean the joining areas (flame-
path) of the Upper and Lower Enclosures before closing them.
NOTE
NOTE
!
CAUTION
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