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© 2017 Bel Power Solutions & Protection
BCG.00966_AA
LDD240-WU
240 W Universal DC-DC Converter
7
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
DESCRIPTION
READ
WRITE
BIT
1, 2
5, 15
Single bit with value 0 or 1
SINT16
3, 4
6, 16
Signed 16 bit value (2’s complement)
UINT16
3, 4
6, 16
Signed 16 bit value (2’s complement)
Table 1. Modbus types
ADDRESS
TYPE
R/W
UNIT
MIN.
MAX.
DESCRIPTION
SETTINGS
0x1000
UINT16
R/W
1
1
99
Modbus address.
0x1010
UINT16
R/W
0.01
4.5
57
Nominal output voltage [V].
0x1011
UINT16
R/W
0.1
1
11
Maximal output current [A].
0x1012
UINT16
R/W
1
1
2
Operating mode (§3.1):
1. Single
2. Parallel
0x1013
UINT16
R/W
1
1
2
Current limitation (§3.2):
1. Hiccup
Constant current
0x1014
UINT16
R/W
1
0
1
Output enable.
0: Disabled
1: Enabled
METERING
0x2000
SINT16
R
0.1V
0
60
Output voltage [V].
0x2001
SINT16
R
0.1V
0
15
Output current [A].
0x2002
SINT16
R
0.1V
0
360
Output power [W].
0x2003
SINT16
R
0.1V
0
60
Input voltage [V].
STATE
0x4000
BIT
R
1
0
1
DC OK
0x4001
BIT
R
1
0
1
Output disabled.
0x4002
BIT
R
1
0
1
Output short circuit.
0x4003
BIT
R
1
0
1
Output overload.
0x4004
BIT
R
1
0
1
USB powered.
0x4005
BIT
R
1
0
1
Over temperature warning.
0x4006
BIT
R
1
0
1
Over temperature error.
0x4007
BIT
R
1
0
1
Output over voltage error.
Table 2. Modbus fields
