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UF3300 Modbus
Message Type
MASK WRITE REGISTER
READ WRITE MULTIPLE
REGISTERS
DIAGNOSTICS
READ DEVICE
IDENTIFICATION
Table 1 - Modbus Messages Supported
Page 6
Message
Number
22 (0x16)
23 (0x17)
08 (0x08)
43/14
(0x2B/0x0E)
Notes
Bits within writable registers
may be set or reset with this
command.
E.g., to set bit 2, set the AND
mask to 0xFFFB (bit 2 low)
and the OR mask to 0x0004
(bit 2 high). To clear bit 2 set
the AND mask to 0xFFFB
and the OR mask to 0x0000.
In general, set all bits in the
AND mask to 1 except for the
bit positions you wish to
modify. Set the matching bit
positions in the OR mask to
the value you want the bit
position to hold.
This command allows the
write and subsequent read of
two, possibly disjoint sets of
registers. The write operation
is performed before the read
operation as per the Modbus
Application Protocol
Specification.
Only the following sub
functions:
00 Return Query Data
01 Restart Communications
04 Force Listen Only Mode
Support to Conformance
level 0x82 (Basic and
Regular Identification –
Stream and individual
Access).
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