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User Manual
Zenex Pro
Digital Input
: Low Water-Level Detection or Timer Start Command Digital Input (Terminals : 6, 7)
Potential-free contact closure input terminals are provided as digital input. This input can either be used for low water level
detection or for issuance of timer start command. When used as water level detection, an user programmable ‘Open’ or ‘Close’
switch position is detected as water level low. When used as timer start command, an Open to Close transition issues start
command.
7
6
Figure 11.4
Figure 11.5
RS485
: Serial Communication Port (Terminals 10, 11)
Connect terminal 11 and 10 of the controller to (+) and (-) RS485 terminals of the Master device.
To ensure reliable operation of the Serial Communication Link (without data corruption due to line noise or reflections), use a
pair of twisted wires inside screened cable with the terminating resistor (100 to 150 Ohms) at one end, as shown in Figure 11.5
below.
Terminating Resistor
Screened Cable
Twisted
Wire Pair
(100 to 150 Ohms)
HOST
B-
B+
Master Device
Serial Comm.
Terminals
B-
10
B+
11
mA / V Output
The Positive (+) of mA / V is available at Terminal 14 & the Negative (-) at Terminal 13.
Relay Output
Potential-free Relay changeover contacts NO (Normally Open) and C (Common) rated 10A/240 VAC (resistive load).
SSR Output
Connect (+) and (-) terminals of SSR to (+) and (-) terminals of controller, respectively. Use Zero-Crossover, 3 to 30 VDC
operated SSR.
