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Write register(s) command:
Byte# Number of bits Example
0x00 Write (0x0022) 16 bits 0x0022
0x02 TransactionID 16 bits 0x1B34
0x04 Number of bytes in
command
16 bits 0x0003
0x06 Register Addresses 8 bits 0x02
0x07 Register value 8 — 64 bits 0x1234
The two previous entries are replicated for every register that has been asked for reading
… Checksum 16 bits 0x…
The max length of this sequence is 180 bytes.
The module answers with the following sequence:
Byte# Number of bits Example
0x00 Write Answer (0x0024) 16 bits 0x0024
0x02 TransactionID (same as
demand)
16 bits 0x1B34
0x04 0x0000 16 bits 0x0000
0x06 Checksum 16 bits 0x…
I2C feature
The Inter-IC bus, commonly known as the I²C bus, is a control bus that
provides the communications link between integrated circuits in a system.
Developed by Philips in the early 1980’s, this simple two-wire bus has
become the de facto worldwide standard for system control, finding its way
into everything from temperature sensors and voltage level translators to
EEPROMs, general-purpose I/O, A/D and D/A converters, CODECs, and
microprocessors of all kinds.
You can find the I2C’s specifications on the Philips web site at the following
link: http://www.semiconductors.philips.com/
The I2C protocol can access a device by three different manners:
Write (Start, AddW, Byte1, Byte2, …, Stop)
S
t
AddW A B
y
tes to W
A
S
p
Read (Start, AddR, Byte1, Byte2, …, Stop)
S
t
Add
R
A B
y
tes to
R
nA S
p
Read After Write (Start, AddW, ByteW1, ByteW2, …, ReStart,
AddR, ByteR1, ByteR2, …Stop)
S
t
AddW A B
y
tes to W
R
A
A
dd
R
A
B
y
tes to
R
nA S
p
FMod-TCP User Manual v.2.8