Danfoss ECL Comfort 310 Service Manual - Page 3

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Service guide

4.0 Modbus network definitions

The below drawing gives a general overview of the serial bus

infrastructure in a Modbus multipoint serial line system.

1) = surge protector

The following conventions are adopted in the figure above:

1. The interface with the trunk is named ITr (Trunk Interface)

2. The interface between the device (ECL 296 / 310) and the

Passive Tap ( surge protector) is named IDv (Derivation

Interface)

3. The interface between the device (ECL 296 / 310) and the

Active Tap (repeater) is named AUI (Attachment Unit Interface)

4. LT = line termination. Resistor: 120 ohm , 0,5 W or 150 ohm,

0,5 W

A multipoint Modbus serial line bus is made of a principal cable

(the trunk) and possibly some derivation cables.

Line terminations are necessary at each extremity of the trunk

cable for impedance adaptation.

VI.LV.H1.02

ECL 296 / ECL 310 Modbus

2) = repeater