Email:
Telephone:
+44 (0)1279 838000
Web:
www.grosvenortechnology.com
Page 5
For more information about Janus C4, visit the website or contact Technical Support:
RS485 configuration
RS485 Connections
Up to 6 Advance controllers (either Single or Multis) can
be daisy-chained together on a 485 line.
A 485 Line Header must be configured to use the 485
protocol.
Other linked controllers are configured as 485 only.
Note that the 485 Line Header doesn’t have to be at the
bus end, it can be anywhere. Fit a 120 ohm termination
resistor at either end of the RS485 bus:
Advance 485
Controller
A
S
B
Advance
Relay
Controller
Screen
Advance 485
Controller
A
S
B
A
S
B
Note that all Janus C4 485 controllers require an Ethernet
connection during the commissioning process.
Use Janus C4
Configurator
to discover and bring the
controller online. Once set up as the correct type and with
the correct network settings, the Ethernet connection can
be disconnected from 485 controllers.
Updating Firmware
The Controller firmware cannot be updated over a 485
connection as the files are too large.
If a firmware update is required while the controller has
an IP connection the
Update Firmware
button will appear
within the Quick Start app, enabling the process to be
completed easily.
If a firmware update is needed subsequently, the firmware
can be updated locally using a USB stick. This is a FAT32
formatted USB stick with firmware/app files in a “firmware”
directory in the root directory.
Advance 485
Line Header
Advance 485
Controller
Advance 485
Controller
Note that a controller’s current firmware version is shown
in the Diagnostics tab
, when the Controller is selected
in
the Configurator
.
To update firmware
1. Open Janus C4 UI and select Navigation > Devices
2.
On the Devices tab, choose Controller and Right-
click and select the Commands option
3. Click the option Arm
4.
At this point, insert the supplied USB stick into the
controller.
Note: You must insert the USB stick within one hour of
selecting the Arm option. Note that no messages appear
in Janus C4 during this process.
5.
While the firmware file is being downloaded, the
controller LED will show a slow white flash. When
it is complete the LED shows a fast red flash. At
this point you can remove the USB stick. If the USB
stick is removed before the process is complete, the
firmware will not be updated.
No messages are shown on the Janus C4 user interface.
485
Controller
Terminate
Here
Terminate
Here
485
Line
Header
485
Controller
485
Controller
485
Controller
