Modbus - BEL LDD240-WU User Manual

LDD240-WU
240 W Universal DC-DC Converter

4.7 MODBUS

LDD240-WU communicates through Modbus/RTU as specified on "MODBUS over Serial Line" and "MODBUS APPLICATION PROTOCOL
SPECIFICATION" documents available on http://www.modbus.org/.
Table 1 contains the field types and Table 2 the mapped fields.
TYPE MODBUS FUNCTION CODES
READ
BIT 1, 2
SINT16 3, 4
UINT16 3, 4
ADDRESS TYPE
SETTINGS
0x1000 UINT16
0x1010 UINT16
0x1011 UINT16
0x1012 UINT16
0x1013 UINT16
0x1014 UINT16
METERING
0x2000 SINT16
0x2001 SINT16
0x2002 SINT16
0x2003 SINT16
STATE
0x4000 BIT
0x4001 BIT
0x4002 BIT
0x4003 BIT
0x4004 BIT
0x4005 BIT
0x4006 BIT
0x4007 BIT
DESCRIPTION
WRITE
5, 15 Single bit with value 0 or 1
6, 16 Signed 16 bit value (2's complement)
6, 16 Signed 16 bit value (2's complement)
Table 1. Modbus types
R/W UNIT MIN.
R/W 1 1
R/W 0.01 4.5
R/W 0.1 1
R/W 1 1
R/W 1 1
R/W 1 0
R 0.1V 0
R 0.1V 0
R 0.1V 0
R 0.1V 0
R 1 0
R 1 0
R 1 0
R 1 0
R 1 0
R 1 0
R 1 0
R 1 0
Table 2. Modbus fields
MAX. DESCRIPTION
99 Modbus address.
57 Nominal output voltage [V].
11 Maximal output current [A].
2 Operating mode (§3.1):
1. Single
2. Parallel
2 Current limitation (§3.2):
1. Hiccup
Constant current
1 Output enable.
0: Disabled
1: Enabled
60 Output voltage [V].
15 Output current [A].
360 Output power [W].
60 Input voltage [V].
1 DC OK
1 Output disabled.
1 Output short circuit.
1 Output overload.
1 USB powered.
1 Over temperature warning.
1 Over temperature error.
1 Output over voltage error.
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