Byte Stream Protocol with MR 100
MR 100 User Manual
Page: 9
MR 100 User Manual
For every request sent to the reader there may be one / more response packets that the reader sends back to the host.
A Typical Response Packet has been described in the following table:
Field
Number of Bytes
(Size)
Value
Description
SOF
1
0x01
Described in Request Packet description.
Node Address
1
0~0x1F
Described in Request Packet description.
Packet Length 1
See Description
Described in Request Packet description.
Command
Mirror
1
See Description
Mirror of the original command in the response packet.
Status
1
See Description
The result or status of a command execution. See Status
Field Description section for more details.
Data
Variable
See Description
In a typical response packet the size of data field may
vary from 0 – to 250 bytes. The first byte of response data
usually contains the error code if error bit of status field
has been set. For more information on error bit see Status
Field Description section. For more information on error
codes see Error Codes Described section.
CRC 2
(1 for LSB & 1 for
MSB)
Dependent
Bitwise inversion of the 16-bit CCITT-CRC of the packet
excluding SOF, with the LSB (Least Significant Byte) first.
For more information on the Byte Stream Protocol section of the Matrics API Programmers Manual.