Hmi (Human-Machine Interface) - Novus fieldlogger Instruction Manual

HMI (HUMAN-MACHINE INTERFACE)

The HMI (Human-Machine Interface) is available as an accessory to the FieldLogger. Several features are implemented
in this device, such as enabled channels monitoring, viewing these channels in chart mode, alarms monitoring, status
checking and configuration of some basic FieldLogger operation parameters.
The HMI is attached to the FieldLogger through a DB9 connector located under its cover. The Fig. 10 and 11
demonstrate how the IHM is connected to FieldLogger.
Both power and serial communication go through the DB9 connector, so it is the only necessary connection. There is
also the possibility of using the IHM remotely, attached to the FieldLogger through an extension cable. As the
communication between IHM and FieldLogger is done through RS485 using a baud rate of 115200 bps what puts a limit
to the HMI operation distance is the power, what means that the voltage drop in the power cables (both positive and
negative cables summed) must be 0.4 V top. Considering a current consumption of 80 mA, it makes the maximum cable
resistance to be 5 ohms. As cable resistance per meter depends mainly on its section, we recommend checking a wire
resistance table. For some common cables, HMI's maximum operation distance is shown in Table 02.
24 AWG
22 AWG
20 AWG
Figure 26 below shows the pin-out needed to build an extension cable to the HMI.
PIN
1
2
3
4
5
6
7
8
9
NOVUS AUTOMATION
Fig. 25 – FieldLogger with HMI
Gauge Section
0.21 mm
0.33 mm
0.52 mm
Table 02 – Wire resistance
Fig. 26 – Building an extension cable
SIGNAL
-
+5 V
-
B / D1 / D+ / D
-
-
GND
A / D0 / D- / D\
-
Table 03 – Pin-out for building the DB9 connectors
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Maximum Length
2
29 m
2
47 m
2
75 m
DESCRIPTION
-
HMI power input: +5 Vdc
-
RS485 Tx/Rx positive data
-
-
HMI power input: ground
RS485 Tx/Rx negative data
-
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