Bus For Connection To An Rs485 Modbus Cms; Bus Connection Between The Units And The Cms - Carrier CCU Controller Bedienungsanleitung

14 - BUS FOR CONNECTION TO AN RS485 MODBUS CMS

14.1 Bus connection between the units and the CMS.

The communication bus between the units and the CMS is a 2-wire RS485 bus
The green light indicates that the data sent by the CMS to the CCU CONTROLLER has been received.
The yellow light indicates that data has been sent by the CCU CONTROLLER to the CMS.
1st Unit
Intermediate unit(s)
Last unit
COM1: Line termination resistor switch
First unit = OFF
Intermediate unit = OFF
Last unit = ON
ON
J10
OFF
1 2 3
COM1
ON
J10
OFF
1 2 3
COM1
ON
J10
OFF
1 2 3
COM1
EN - 28
To CMS
Multiconductor cables,
shielded, jacketed
(shielding with braiding),
length between the 1st and
the last CCU CONTROLLER:
1000 m
1: Line A or +
2: Line B or -
3: Earth
To ensure correct operation,
the line must be polarised.
Multiconductor cables,
shielded, jacketed
(shielding with braiding),
length between the 1st and
the last CCU CONTROLLER:
1000 m
1: Line A or +
2: Line B or -
3: Earth