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90 205486 REV F Operations Manual, HPA2, Compact Outdoor SSPA
10.2.5 Error Status / Data Address
This byte is a tag extension byte and specifies the first data element of the tagged data. If the
Data Length is more then 1 byte, then all subsequent data fields must be accessed starting
from the specified address. For example if the requestor wants to access the amplifier’s
unique network address, it should set data tag 0 (System settings tag) and data address 8
(see System Settings Details table). If the following Data Length field is more than 1, then all
subsequent Settings will be accessed after the Unique Network Address. When the
Response Frame Data Address is omitted, this byte position is replaced with the Error Status
fields. The various error codes are given in Table 10-3. Note that the Request and Response
frames are different.
10.2.6 Data Length
This byte contains different information for Request and Response frames. In a Request
frame, it specifies the number of data bytes that are to be accessed starting from the first byte
of the value specified in the Data Address byte. That byte must not exceed the maximum data
bytes for a particular tag. The maximum data length for the Settings tag is 26 bytes. The
maximum data length for the System Threshold tag is 6 bytes.
10.2.7 Data Field
The actual data contained in the packet must be placed in this field. The “Get Request” type
of command must not contain any Data Field. Any “Get Request” will be rejected if any data is
present in the Data Field. Generally, the Bad Checksum error code will be added to the
response from the amplifier if the word size of the information is 16-bits or 2-bytes. Each data
word is placed in the frame with its least significant byte first. All data with length of 2 bytes
must be represented as integer type with maximum value range from 32767 to (-32767).
Error Code Name Byte Value Possible Cause
No Errors 0 Normal Condition, no errors detected
Data Frame Too Big 1 Specified Data length is too big for amplifier buffer to ac-
cept
No Such Data 2 Specified Data Address is out of bounds for this tag data
Bad Value 3 Specified value not suitable for this particular data type
Read Only 4 Originator tried to set a value which has read only status
Bad Checksum 5 Trailer checksum not matched to calculated checksum
Unrecognizable Error 6 Error presented in incoming framed, but SSPA failed to
recognize it. All data aborted
Table 10-3: Error Status Byte Values