Novar NOVAR-1xxx NRC, Operating Manual, Page: 11 / 27

Novar-NRC KMB systems
11
2.4 Parameters 50, 51, 52 – Instrument Address, Communication Rate and
Communication Protocol / NRC86 response timeout
Parameter 50 specifies the instrument address for remote control and monitoring of the PFC with the
Retis ot the Envis program. But this function cannot be used in a remote control mode because the
communication link is reserved for connection with the NRC86 unit(s). So the parameter value has no
meaning in this mode (the PFC uses fixed addresses 200 and higher for communication with the
NRC86(s) ).
The communication rate ( parameter 51) must be set identically as the communication rate of the
NRC86 unit(s). It is recommended to use default value 9.6 kBd or, according local conditions ( cable
length, interference level, … ), it is possible to increase it if applicable. In the
RCC mode
the set value
is not critical, in the
I/O mode
the higher value can bring better performance.
Parameter 52 setting is relevant only when any remote control mode ( either the
RCC
or the
I/O
) is
activated in parameter 53. In such case it doesn’t specify the communication protocol as usual but it
defines maximum wait time for response from the NRC86 unit(s). For default value 0 the NRC86
response timeout is approx. 0.3 sec – this setting is suitable for transparent communication links ( that
have no transmission delay).
For non-transparent communication media (with transmission delay) such like radiomodems,
GSM/GPRS modems, LAN etc., it is necessary to set this parameter value to maximum wait time for
response from the NRC86 i seconds ( in range 1 – 2 – 3 – 5 – 8 ).
If the remote control mode is switched off the parameter 52 has its usual meaning – the type of
communication protocol. But as the „NRC“-version PFCs don’t support the Modbus protocol the value
is fixed to P0 (= KMB protocol ).
2.5 Parameter 53 – Remote Control Mode
With this parameter you can activate the so-called
remote control mode
. In this mode, the PFC
cooperates with a NRC86 control unit (or more units) interconnected with a serial interface. The
interface is used to full capacity during remote control mode and therefore remote monitoring and
control of the PFC with the Retis or the Envis program is not possible.
Tab. 2.3 : Parameter 53 – Remote Control Mode Setting Options
setting description note
-- -- -- --
remote control mode is switched off communication interface can be used for
PFC remote monitoring & control (Retis,
Envis)
i0 i0 i0 i0
I/O-mode
only with up to 7 NRC86 units number of the units connected defined by
their setting
i0 i0 i0 i0
.
I/O-mode
and actual PFC state
broadcast
actual PFC state is simultaneously
transmitted to the NRC86
rCC
rCC rCC
rCC
RCC-active mode
driven by the 1st
NRC86 unit and optional simultaneous
I/O-mode
with up to 6 additional NRC86
units
to be set at the „master“ PFC only
rCC rCC rCC rCC .
RCC-active mode
with actual PFC state
broadcast
actual PFC state is simultaneously
transmitted to the NRC86
rCCP rCCP rCCP rCCP
RCC-passive mode
to be set at the „slave“ PFCs