Lexicon DC-2 - Manual (Page 17)

Lexicon, Inc.
DC-2/MC-1 Serial Communications Protocol
Printed on: 10/19/00
17 of 44
Max: Set by the System Parameter Count in the “Unit Configuration Packet”.
7.3.7.3 Data Validation:
The ParamId must be a valid parameter number. If it is not the DC-2/MC-1 will respond with a NAK
packet and error code DC_ERR_ INVALID_PARAM_NUMBER.
7.3.7.4 Get System Parameter Definition by Name Command Packet
Application Header:
Command
DC_CMD_GET_SYS_PARAM_BY_NAME 0x19
Data Count strlen(ParamName) + 1 nn
Application Data:
Data[0]-Data[DataCount-1] ParamName
ch ch ch … 0x00
7.3.7.5 Data Description
ParamName:
Data Type: Null(0x00) terminated ASCII character string.
Max Length: PARAM_NAME_LENGTH defined in Appendix E Protocol Constants.
7.3.7.6 Data Validation:
The ParamName must be a valid Parameter name. If it is not the DC-2/MC-1 will respond with a NAK
packet and error code DC_ERR_ INVALID_PARAM_NAME.
7.3.7.7 System Parameter Definition Response Packet
This packet describes the defining information for a given system parameter.
Application Header:
Command
DC_RESP_SYS_PARAM_DEF 0x83
Data Count 3 + strlen(ParamName) + 1 nn
Application Data:
Data[0]
ParamId nn
Data[1] MaxValue nn
Data[2] Value nn
Data[3]- Data[DataCount-1] ParamName ch ch ch … 0x00
7.3.7.8 Data Description
ParamId: The Integer Id assigned to this system parameter.
Data Type:
Unsigned 8 bit integer
Max: Set by the System Parameter Count in the “Unit Configuration Packet”
MaxValue: Maximum Value allowed for this system parameter.
Data Type:
Unsigned 8 bit integer
Max: 255
Value: The Current Value for this system parameter.
Data Type:
Unsigned 8 bit integer
Max: MaxValue(in this Packet)
ParamName:
Data Type: Null(0x00) terminated ASCII character string.
Max Length: PARAM_NAME_LENGTH defined in Appendix E Protocol Constants.