Subsystems
CGS-240 Manual 6/15/2021
Page 74 of 148
The ECB’s LEVEL INPUTS are 5 volt digital inputs used for liquid level controls. The generator does not use these
digital inputs directly. On the generator, an analog liquid level probe is used. For this configuration, the analog
probe is connected to the ANALOG LEVEL INPUTS section of the ECB. The output from this analog section is a
digital signal which is then tied to the digital LEVEL INPUTS section via a jumper.
Presat level from ANALOG LEVEL INPUTS – LVL 4
6.6.5 ANALOG LEVEL INPUTS
The ECB’s ANALOG LEVEL INPUTS are configured for capacitive liquid level probes. A comparator in the circuit
converts the analog signal to a digital output. A jumper associated with each channel then allows the digital output
from an analog circuit to be fed into the associated digital LEVEL INPUTS channel.
6.6.6 UARTS
The ECB contains 8 fully independent Universal Asynchronous Receiver Transmitter (UART) serial ports which are
configurable for either RS-232 or RS-485 communication. The following table lists the configuration and connected
devices for each of these serial ports.
Flowmeter & inlet pressure gauge
Prl, Pressure sensor
Prh, Pressure sensor
RS-485, 9600, 8, 1, N
RS-485, 9600, 8, 1, N
Section 6.2.6
Section 6.2.6
V1, Flow Control Valve
V2, Expansion Valve
RS-485, 9600, 8, 1, N
RS-485, 9600, 8, 1, N
Section 6.2.3
Section 6.2.4
NOTE: The ECB component labels for the Analog and Digital Level Inputs are similarly labeled.
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