YSI 5200 - Manual (Page 80)

YSI Incorporated 78 5200 Recirculating System Monitor
Section 8. Network
Multiple 5200 Recirculating Monitors can be connected together via their RS485 network ports (see 8.1
RS485 Network). Each network (group of connected 5200s) consists of 1 Master unit and up to 31 Slave
units. The default network Mode setting is Master.
NOTE: Each Slave in the network must have a unique Sub Address.
8.1 RS485 Network
The 5200’s optically isolated RS485 interface is located on the upper right hand corner of the I/O plate.
Up to 32 YSI 5200 Monitors can connected per network (1 master, 31 slaves). Each network requires a
PC COM port, so conceivably a PC could support multiple 32-instrument networks. This provides
significant flexibility in regard to alarming, monitoring and control.
The RS485 network wiring can span distances up to 4000 feet. If additional length is required, use an
RS485 Line Extender/Booster. Not using this device may cause communication failures. Mount the
booster in an area where it is protected from moisture.
NOTE: The 5200’s RS485 port is optically isolated. No further isolation is required.
Two snap-on ferrite assemblies, YSI# 655361, are included with the 5200 Monitor. Wires being
connected to the RS485 port need to be routed through the ferrites as shown in Figure 3-9. Failure to do
so could cause catastrophic monitor failure.
Terminal Connection Description (From left to right on I/O plate RS485 network connector)
1. T (-) Transmit to Network
2. T (+) Transmit to Network
3. R (-) Receive from Network
4. R (+) Receive from Network
8.1.1 Network Wiring
The network consists of 2 pair of twisted pair cable. Although, Category 3 and 4 cables can be used,
Category 5 Ethernet cable is recommended. Strip the wires about 2 times longer than necessary so that
they can be folded over and twisted to make a thicker connection. Below is an example with Ethernet
Category 5 cable. Note that this example color scheme is only applicable with category 5 wire:
Pair #1: Solid blue wire and white wire with blue stripe
Pair #2: Solid orange wire and white wire with orange stripe
The Master 5200 is wired as follows:
Wire Terminal Connection
Solid Orange Wire 1 T (-)
White w/Orange Stripe 2 T (+)
Solid Blue Wire 3 R (-)
White w/Blue Stripe 4 R (+)
NOTE: Install one 120
Ω (ohm) resistor between T(+) and T(-) and one 120Ω (ohm) resistor between
R(+) and R(-) on the master 5200. Resistors are included with each 5200.
All 5200 slaves are wired as follows: