4
Instructional Leaflet
IL66A7508H09
Effective October 2016
mMINT—Modbus translator module—
installation and use
EATON
www.eaton.com
INCOM connections
INCOM connector:
This 3-pin connector provides the interface to
the INCOM network . Refer to
Table 2
.
Table 2. INCOM connector pin outs
Pin number
Input/output signal
1
INCOM carrier network
2
INCOM carrier network
3
Shield
Connect shield wire to ground at master device end only .
Interconnect shielding where devices are daisy chained .
Modbus connections
Modbus RS-485 Connector:
This 4-pin connector provides the
interface to the Modbus RTU network . The polarity is “critically”
important . Refer to
Table 3
.
Table 3. Modbus RS-485 connector pin outs
Pin number
Input/output signal
1
RS-485 Network-A (non-inverting)
2
RS-485 Network-B (inverting)
3
Common
4
Shield
RS-485 Network-A is the non-inverting differential connection for the
Modbus RTU network . RS-485 Network-B is the inverting differential
connection for the Modbus RTU network .
Figure 4. Indicators
Section 5: Switches and indicator LEDs
Refer to
Figure 4
to locate the Status LED for the mMINT module .
Figure 5
shows the location of the configuration switches .
SW2 SW3
SW1
Closed
Open
Figure 5. Switches
Modbus RS-485 network Rx LED (green)
The LED will be lighted whenever the module is receiving from the
Modbus RTU network .
Modbus RS-485 network Tx LED (green)
The LED will be lighted whenever the module is transmitting on the
Modbus RTU network .
INCOM network Rx LED (green)
The LED will be lighted whenever the module is receiving from the
INCOM network .
INCOM network Tx LED (green)
The LED will be lighted whenever the module is transmitting on the
INCOM network .
Status LED (green)
This indicator will be flashing whenever the module is powered up
and the microcontroller is executing instructions . The flashing rate is
approximately 1 second ON / 1 second OFF . However, detection of
a communications error on either the Modbus or INCOM network
will result in an increased flashing rate approximately 1/2 second ON
/ 1/2 second OFF . The rate will return to normal when the network’s
diagnostic reset subfunction (clear UART or slave counters,
respectively) is processed by the mMINT . See Section 6 and
Table 6
.
INCOM 100 ohms termination DIP switch (SW1)
This switch should be moved to the ON position only when it is the
last unit in a chain of units or if it is a single unit .
Modbus RS-485 baud rate DIP switch (SW2)
To configure the data transfer rate for the Modbus RTU network,
three switches in DIP switch SW2 should be moved to either the
CLOSE or the OPEN position based on the rate required . Refer to
Table 4
. SW2-1 is for mMINT diagnostics .
