Thermo Scientific AquaSensors AquaChlor, Руководство пользователя

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Thermo Scientific AquaSensors
™
AquaChlor
™
Free Chlorine Monitor User Guide 17
4. Wiring
Each communications adapter has a label printed at the end of the cable that indicates the supported protocol
and the corresponding wiring chart. The standard cable length is 10 feet with the idea that the cable will
terminate in a junction box. It is however possible to order the communications adapter with any length of cable
up to the maximum allowed by the particular protocol being used. (Note: In the pre-packaged AquaChlor
System configuration, both the free chlorine and pH sensors are supplied with 30 inch cables.) In practice all
adapters have four wires and a shield. Any Class 2 DC power supply that provides 24VDC can be used.
For DeviceNet, Modbus and RS-232 cables, the RED and BLACK wires are for power, the BLUE and WHITE
wires are for communications, and a bare shield wire is connected to EARTH GROUND for safety and
electromagnetic immunity and emissions.
Color DeviceNet Modbus RTU RS-232
RED 24 VDC 12 to 30 VDC 12 to 30
VDC
BLACK Signal
Ground
Signal Ground Signal
Ground
BLUE CAN_L Comms (-) Rx
WHITE CAN_H Comms (+) Tx
SHIELD Earth Earth Earth
All Ethernet Adapters (Ethernet/IP, Modbus TCP, PCCC and TCP/IP) are terminated with an RJ45 connector
that plugs in to any PoE switch or power injector.
All USB Adapters are terminated with a USB connector that plugs into most PC’s. Power is supplied by the
host computer.
When an AV38 local display is used, the sensor must be configured with a Modbus RTU communications
adapter.