Installing i-on Control Units
Page 43
Figure 25. Auxiliary tamper wiring
n
RS485 bus termination link
Note:
Not available in i-on Compact.
If a single daisy chain of devices is connected to the bus connector, and the control unit is
at one end of the chain, fit a jumper across the bus termination link in the control unit and
in the last device on the bus.
The i-onG3MM has one termination link for each bus connector.
RS485 termination can improve performance in electrically noisy environments.
Please refer to page 24 for further guidance.
o
LEDs
3V3
(and
12V
in i-on Compact): Lit when the internal power supply is functioning.
HB
(heartbeat): Flashes approximately once every two seconds to indicate normal
operation.
LNK/ACT
(
LINK/ACTIVITY
): Flashes when the control unit is connected to the
network and there is network activity.
RFTX
(i-on Compact only): Lit when there is radio transmission.
p
16.5VAC input
Note:
Available only in i-onG2SM.
This input can be used to instead of the standard 3-pin push-fit transformer connector to
provide 16.5VAC power to the PCB. Typically, it is used when upgrading an i-on30EX to
an i-onG2SM.
q
External DC input
Note:
Available only in i-on Compact.
You can power the control unit using an external 10-15Vdc power supply connected to the
DC IN and 0V terminals.
r
WiFi module power
Note:
Available only in i-on Compact.
You can use these terminals to provide power to an optional WiFi module. You can mount
the module in the space provided on the backplate (see Figure 6).
Note:
The backup battery does not provide power to these terminals in the event of a
mains failure.
s
Mini-B USB port
Note:
Available only in i-on Compact.
You can connect a PC to this port and use the Update Utility to update the firmware.
2k2
AUX
TAMP