Distech Controls ECLYPSE ECY-400 Series Installation Manual page 14

Figure 17: Modbus RTU Communications Wiring
If inserting multiple wires in the terminals, ensure to properly twist wires together prior to inserting them into the terminal connectors.
The RS-485 port must be configured in EC- gfx Program prior to use. Modbus devices are integrated into EC- gfx Program using the EC- gfx Program Mod-
bus device block.
Modbus TCP Communications Wiring
Ensure that you have at least a C1 Connectivity Pack to enable the Modbus functionality and use of RS-485 ports. See the controller's Spec
Sheet for more details.
This applies to both the on-board RS-485 port and any additional modules.
Connect Modbus TCP devices to the same IP subnet the controller is using. This connection can be made by connecting the Modbus TCP device to an
Ethernet port on the ECY-600 Series controller with a Cat5e network cable for example (see Wired Connection). For more connection options, refer to
the ECLYPSE User Guide.
Modbus devices are integrated into EC- gfx Program using the EC- gfx Program Modbus device block.
M-Bus Communications Wiring
Ensure that you have at least a C1 Connectivity Pack to enable the M-Bus functionality and use of M-Bus ports. See the controller's Spec Sheet
for more details.
M-Bus communications are made by connecting meters directly in an M-Bus port.
The controller provides an M-Bus port when connected to an ECY-MBUS extension module via a USB connection.
The M-Bus port must be configured in EC- gfx Program prior to use. M-Bus meters are integrated into EC- gfx Program using the M-Bus device block.
Maximum M-Bus Device Wiring Length
The following information provides wiring limitations for M-Bus devices. The wiring length provided below was tested as a worst-case scenario with all
meters being located at the end of the bus. If meters are more evenly spaced along the bus, then the maximum wiring length can possibly be increased.
Testing Conditions:
Current per slave/meter
Max ∆V accepted on the bus
Cable capacity
USB Connection:
14 / 15
1.5 mA
2 V
110 nf/km