Lexicon MC-12 V3.0 - SERIAL COMMUNICATIONS PROTOCOL DEFINITION REV 1-5 User Manual

Lexicon, Inc.
MC-12 Serial Communications Protocol Printed on: 08/18/03
© 2003 Lexicon, Inc. All rights reserved. 37 of 94
7.3.37.2 Data Description
ParamId:
Data Type: Unsigned 16 bit Integer
Max Value: Max Parameter Count as reported by the MC-12 Unit Configuration Response
Packet in 7.3.39.2
ParamType:
Param Type Name Param
Type
ID
Type Description Data
Size
(Bytes)
PARAM_TYPE_UINT8 0 Unsigned 8 bit integer(0 to
255)
1
PARAM_TYPE_UINT16 1 Unsigned 8 bit integer(0 to
65535)
2
PARAM_TYPE_CSTR8 2 Zero terminated string of 8
ascii characters
9
PARAM_TYPE_CSTR13 3 Zero terminated string of 13
ascii characters
14
PARAM_TYPE_UINT32 4 Unsigned 32 bit integer (0 to
4,294,967,295 )
4
PARAM_TYPE_BOOLEAN 5 Boolean (0 to 1) 1
PARAM_TYPE_INT8 6 Signed 8 bit integer
(-127 to 128)
1
PARAM_TYPE_BRANCH 7 Parameter Branch N/A
PARAM_TYPE_INT16 8 Signed 16 bit integer
(-32,767 to 32,768)
2
PARAM_TYPE_CSTR20 9 Zero terminated string of 20
ascii characters
21
Value:
The data value transmitted is dependent on the ParamType, as described above. The Data
Value is always packed starting at the Value[0] byte in the packet. For multi-byte data,
the values are packed LSB first(Value[0]) to MSB(Value[0+(num bytes-1)]). For
example: Setting a given signed 16 bit parameter to a value of -300 the data array would
be packed as follows:
Value[0] = 0xd4
Value[1] = 0xfe
Value[2 - 13] = don't care.
All signed values are in the 2's compliment format.
7.3.37.3 Data Validation:
The ParamId must be a valid Parameter. The ParamType must be valid for the given ParamId. If either of
these condition is not true the MC-12 will respond with a NAK packet and error code DC _
INVALID_PARAM_ID. The data value size cannot exceed the size of a given data type. A value that does
exceed the size of a give data type will be truncated to the appropriate size. The ParamType transmitted
must match the ParamType for the Parameter being transmitted, as per the Parameter Definition as
transmitted by the MC_SYS_PARAM_DEF_PKT . If the types do not match The MC-12 will transmit a

Lexicon MC-12 V3.0 - SERIAL COMMUNICATIONS PROTOCOL DEFINITION REV 1-5 Specifications

General

Brand	Lexicon
Model	MC-12 V3.0 - SERIAL COMMUNICATIONS PROTOCOL DEFINITION REV 1-5
Category	Computer Hardware
Language	English