IRMCS2033

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12

Bit Position

7

6

5

4

3

2

1

0

1=Read/

0=Write

Register Map Starting Address

Command/Address Byte Format

Bit Position

7

6

5

4

3

2

1

0

1=Error/

0=OK

Register Map Starting Address

Command Acknowledgement Byte Format

The following example shows a command sequence sent from the host to the IRMCK203 requesting a two-byte

register write operation:

0x2F

Write operation beginning at offset 0x2F

0x02

Byte count of register data is 2

0x00

Data byte 1

0x04

Data byte 2

0x35

Checksum (sum of preceding bytes, overflow discarded)

A good reply from the IRMCK203 would appear as follows:

0x2F

Write completed OK at offset 0x2F

0x2F

Checksum

An error reply to the command would have the following format:

0xAF

Write at offset 0x2F completed in error

0xAF

Checksum

RS-232 Register Read Access

A register read operation consists of a command/address byte, byte count and checksum. When the IRMCK203

receives the command, it validates the checksum and transmits the register data to the host.

Command / Address Byte

Byte Count

Checksum

Register Read Operation

Command Acknowledgement Byte

Register Data (Byte Count bytes)

Checksum

Register Read Acknowledgement (transfer OK)