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CLASSIC 800 Product Manual
Setup & Operation
RS-485 Remote Communications
The RS-485 remote communications port is connected as follows:
485 (C)
The common ground reference used on some three wire half-duplex systems. While no current
should pass through this conductor, it should not be used as a shield. If using a shield it should only
be connected to ground at one point, usually at the PLC or computer.
485 (A-)
The A or negative data line.
485 (B+)
The B or positive data line.
485 (T)
This pin provides an AC coupled terminator of 120 ohms when shorted to 485 (A-). This feature
eliminates the need to add an external terminator. It is AC coupled to reduce power consumption
when the 485 bus is idle. For more details on AC vs. DC termination of RS-485 networks, contact
Kayden technical support at telematic.com.
Notes:
For more information see Figures 11 & 12.
USB to RS-232 (DB-9) Adapter
Adapts the Kayden SCA to USB for computers without
a serial port.
Part Number: A15-322
RS-232 (DB-9) to RS-485 Adapter
The SCA is an RS-232 to RS-485 adapter for Modbus
communication protocol. The
SCA derives power from the
Kayden switch.
Part Number A15-321
Communication Cable
is used to connect
the SCA (Serial Communication Adapter)
to the switch.
Standard Lengths: 4, 8 & 10 feet.
Part Number: A05-CC-0004
4 feet
A05-CC-0008
8 feet
A05-CC-0010
10 feet
These items can be purchased separately but are required to use the Kayden RCM software.
Converters / Adapters - USB to RS-232 & RS-232 to RS-485
Communication Cable
USB to RS-485 Adapter
Combines functions of USB to DB-9 and DB-9 to
RS-485. Driverless functionality with newer operating
systems.
Part Number A15-323
