Explosionproof Design - Emerson Bettis RTS Installation, Operation And Maintenance Manual

Section 2: Connection
November 2021
Connecting at the End of a Strand, Bus Termination
There is either no device connected to the bus in front or behind of the new Slave-Device.
Line configuration:
Figure 4
Bus termination:
Modbus RTU has to be terminated on both ends of every strand. Termination can be
accomplished through the termination resistor implemented in your RTS control unit. Bus
termination is activated when the respective switch on the connection board is switched to
"ON" as seen in Figure 4 (A. Single Channel).
2.2

Explosionproof Design

Normally, in explosionproof design, there is no termination available in the control unit.
That means, the bus termination must be done seperate outside of the control unit.
Optionally, a bus termination in the control unit is possible as well, this must be specified
by the order.
In this case, you can activate the bus termination by connecting the following terminals:
•
•
WARNING
!
The shield must be connected to the shielding connection clamp (windowcut), see Figure 5
or Figure 6.
4
Installation, Operation and Maintenance Manual
A. Single Channel
A with AT and B with BT (single channel version) or
A1 with A1T, B1 with B1T, A2 with A2T and B2 with B2T (dual channel version)
VCIOM-16741-EN Rev. 0
B. Dual Channel
Connection