Email: ac-support@grosvenortechnology.com
Telephone: +44 (0)1279 838000
Web: www.grosvenortechnology.com
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For more information about Janus C4, visit the website or contact Technical Support:
RS485 conguration
RS485 Connections
Up to 6 Advance controllers (either Single or Multis) can
be daisy-chained together on a 485 line from a Line
Header.
Advance 485
Controller
A
S
B
Advance
Relay
Controller
Screen
Advance 485
Controller
A
S
B
A
S
B
Advance 485
Line Header
Advance 485
Controller
Advance 485
Controller
A 485 Line Header must be congured before
attempting to add RS-485 controllers.
RS-485 only controllers must be congured via
ethernet, when conguring an RS-485 only controller
please choose the correct Line Header that the RS-
485 controller will communicate too.
The RS-485 only controllers will auto-address, once
congured remove the ethernet connection and
connect the controller to the Line Headers 485 line.
Note: When the Line Header or the RS-485 Only
controllers are being added to the system, please do not
disconnect the ethernet cable for at least 10 minutes, this
is to ensure the application rmware is loaded correctly to
the Line Header / RS-485 Only Controller.
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:
485
Controller
Terminate
Here
Terminate
Here
485
Line
Header
485
Controller 485
Controller 485
Controller
Note: That all Janus C4 Line Headers and 485 controllers
require an Ethernet connection during the commissioning
process.
Use Janus C4 Congurator 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 rmware cannot be updated over a
485 connection as the les are too large.
If a rmware 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 rmware update is needed subsequently, the
rmware can be updated locally using a USB stick.
This is a FAT32 formatted USB stick with rmware/
app les in a “rmware” directory in the root directory.
Note: That a controller’s current rmware version is
shown in the Diagnostics tab, when the Controller is
selected in the Congurator.
To update rmware
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 rmware le is being downloaded, the
controller LED will show a slow white ash. When
it is complete the LED shows a fast red ash.
At this point you can remove the USB stick. If
the USB stick is removed before the process is
complete, the rmware will not be updated.
No messages are shown on the Janus C4 user
interface.
