iSMA-B-FCU Hardware User Manual
www.ismacontrolli.com
DMP242en | 1st Issue rev. 3 | 02/2022
page 14 of 53
•
•
Figure 8. RJ12 pins
For short distance, up to 100 m, it is recommended to use the following cables for
connection: standard
category 3,
4 wire or 6 wire telephone cable straight without
crossing (for example, YTLYP 6x0.12). For longer distance, it is recommended to use a
twisted shielded Modbus standard cable.
4.6 Front Panel and DIP Switches
Figure 9. FCU front panel
4.6.1 USB1 Port
The iSMA-B-FCU device has a built-in mini USB1 port designed to manage controller
firmware and application, as well as for diagnostics.
This USB1 port also provides controller power supply for commissioning processes and
for application diagnostics. If the controller is powered up by a USB, all inputs and
outputs are operational (except for triac outputs, which require external power supply).
4.6.2 LED
The iSMA-B-FCU device is equipped with 4 LED diodes for quick status check and
diagnostics:
The power LED (ON) lights up (green) after turning the power on.
The communication LED (COM1) lights up (orange) for 20 ms after sending each
package through the main RS485 port. As long as module receives/sends packages,
the communication LED blinks continuously.
