YSI 5200 - Manual (Page 81)

YSI Incorporated 79 5200 Recirculating System Monitor
Wire Terminal Connection
Solid Blue Wire 1 T (-)
White w/Blue Stripe 2 T (+)
Solid Orange Wire 3 R (-)
White w/Orange Stripe 4 R (+)
NOTE: On the final slave in a string, install one 120
Ω (ohm) resistor between T(+) and T(-) and one
120 Ω (ohm) resistor between R(+) and R(-). Resistors are included with each 5200.
8.2 Auxiliary Inputs Wiring
The auxiliary inputs are configurable for a number of applications including monitoring level and/or
pressure switches. Both inputs have input protection, but the maximum input voltage should be no more
than 6 VDC. YSI recommends that twisted pair wire be used for these connections.
CAUTION: The auxiliary inputs are not isolated. Devices connected must be electrically isolated from
ground and the water.
CAUTION: Observe correct polarity on analog input. Do not apply negative voltage to analog input.
Two snap-on ferrite assemblies, YSI# 655361, are included with the 5200 Monitor. Wires being
connected to the Auxiliary ports need to be routed through the ferrites as shown in Figure 3-9. Failure to
do so could cause catastrophic monitor failure.
Auxiliary inputs can be configured as follows:
Input #1 – Digital (contact open/close w/current source) Caution: Do not input external voltage.
Input #2 – User Defined (0 to 1.0 VDC, 0 to 5.0 VDC, or 4 to 20 mA selectable; max. 6.0 VDC) 10K
impedance
or
Digital (contact open/close w/current source) Caution: Do not input external voltage.
NOTE: For proper digital input operation, use low impedance switches and wiring. The total resistance
should not exceed 200 ohms.
8.2.1 Example (Digital)—Installing a Float Switch
1. Install the float switch at the desired water level according to the manufacturer’s instructions.
T(-) T(+) R(-) R(+) T(-) T(+) R(-) R(+)
Master
\ \ \ \
T(-) T(+) R(-) R(+)
Final slave
RS485 Wiring Diagram for 3 Networked 5200s
120 Ω
\ \ \ \
120 Ω 120 Ω 120 Ω
T(-) T(+) R(-) R(+)
All other slaves
\ \ \ \