The built-in channel is linked to the bus via the TSX SCA 50 device through the TSX SCY CM 6030 connection cable.
Illustration of TSX SCY 21601:
Connecting the TSX SCA 50 Unit
NOTE:
On a Modbus bus you must:
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polarize the line, in general in only one spot (usually on the master device) with 470 O resistance. Connect Rpull-down to EMI- (D(A)) and Rpull-up to EMI+ (D(B)).
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adapt the line on the two end devices with a resistance of 150 O between EMI+ and EMI- (EMI+ is already connected internally by the card)
Modbus without Line Adaptation
The following diagram shows the wiring of a slave in intermediate position to the Modbus network:
Modbus with Line Adaptation and Polarization
The following diagram shows the wiring of a master, placed at the end of the Modbus network:
