Paradise RA 5785 User Manual download pdf (Page 64)

64 208143 REV - Operations Manual, HPA3, Mini Compact Outdoor SSPA

8.1.2.5 Data Address / Error Status / Local Port Frame Length

This field is a tag extension byte and specifies the first table element of the tagged data. If the

Data Length is more than 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.

Important! In the Response Frame Data Address filed replaced with the Error Status informa-

tion. The various error codes are given in Table 8-4.

8.1.2.6 Data Length

This byte value specifies the number of bytes attached in the Data Filed. For the Get

command, it specifies the number of data bytes that have to be returned by the SSPA unit to

a host PC in the Response frame. For Set commands, the value of this byte specifies the

number of data fields to be accessed starting from the address specified in the Data Address

byte. In general, the Data Length value plus the Data Address must not exceed the maximum

data size particular tag.

8.1.2.7 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. “Get Request” will be rejected if any data is pre-

sent in the Data Field. Generally, the Bad Checksum error code will be added to the response

from the unit. In case the data length is 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 to big for respondent buffer to accept

No Such Data 2 Specified Data Address is out off 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

Error presented in originator frame, but respondent failed to

recognize it. All data aborted.

Table 8-4: Error Status Bytes

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 81 82

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Paradise RA 5785 User Manual Page 64