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100 208528 REV M Operations Manual, 7RU SSPA Chassis
7.2.2.4 Data Tag
The data tag specifies the type of internal resource of information needed to be accessed on
the amplifier. The data associated with certain tags is read only. Therefore, only the “Get”
command byte would be associated with these data tags. The data tag byte values are given
in
Table 7-3 .
7.2.2.5 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 than 1 byte, then all subsequent data fields must be accessed starting
from the specified address. For example, if the requester wants to access the amplifier’s
unique network address, it should set data tag 0 (Systems settings tag) and data address 8
(see Systems Settings Details table). If the following Data Length field is more than one (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 7-4 . Note that the Request and Response
frames are different.
Tag Name
Byte
Value
Minimum
valid length
of Data Field
Description
System
Tag Settings
0 1 byte
This tag allows accessing various system set-
tings on remote unit. Host access status: Full
Read/Write access. Settings can be modified
at any time. Some settings may require hard-
ware reset of the remote SSPA unit.
System
Threshold Tag
1 2 bytes
This tag allows access to the critical unit
thresholds. Host access status: Read only ac-
cess. New thresholds are in effect immediately
after change.
System
Conditions Tag
3 1 byte
This tag allows access to the unit’s internal
conditions flags, such as fault status or current
system status. Host access status: Read only.
This type of data cannot be set or modified re-
motely.
ADC Channels
Access Tag
4 2 bytes
This tag allows access to the unit’s internal An-
alog to Digital converter. Host access status:
Read only. This type of data cannot be set or
modified remotely.
Reserved 2 N/A
This tag is reserved and not used for SSPA
applications.
Table 7-3: Data Tag Byte Values