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RS485
Ethernet
Thermo Scientific
To communicate with multiple detectors via RS485 party line, each unit must be
assigned a unique unit identification number so it can be addressed individually. By
default, all detectors are assigned unit number one (1).
Note: Connecting a PC serial port (Com) to the RS485 port on the detector
requires an RS485/RS232 converter.
To assign a unique unit number to each detector, you must be able to communicate
with each one individually. Disconnect each detector from the party line in turn and
communicate with the disconnected detector directly. Alternatively, remove power
from all detectors except one and assign a unit number to the powered detector. Repeat
this procedure for the remaining detectors.
If trouble arises when using another device on the RS485 chain, verify that the device
is properly terminated for its position on the chain. To terminate a device, connect a
120-ohm resistor between its RS485 +/- data terminals. Never terminate more than the
first and last device in the chain.
Each LevelPRO unit includes a 10 Base-T minimum Ethernet port on the Main CPU
PCA. Operators should ensure the area is non-hazardous before connecting or
disconnecting the Ethernet cable.
The Communication Setup screens also allow for configuration of the Ethernet port.
Note: IP addresses are examples only.
Figure 4-2. Communication Setup, Ethernet
1. Enable or Disable the Ethernet port.
2. Configure the Ethernet IP address, Subnet Mask, and Ethernet IP Gateway.
Operation
Communication Setup
LevelPRO User Manual
4-3
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