Kramer Electronics SP-14 - Manual (Page 18)

The parameter request packet takes the following format:
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‘A’ ‘P’ ‘C’ paramID attribute value ‘A’
Where
‘A’, ‘P’, ‘C’ are literal ASCII characters.
paramID is the parameter identifier. (see 3.2.1.2 Parameter Identifier)
attribute is the attribute identifier. (see 3.2.1.3 Attribute)
value is a value.
Only the avParamAttr_value and avParamAttr_e2value attributes may be set and these must be use
together. The avParamAttr_value attribute changes the specified parameters’ value. The
avParamAttr_e2value attribute either writes the specified value into persistent storage or writes the
value that was previously set using the avParamAttr_value attribute. Writing to persistent storage can
be slow therefore the recommended usage is to use the avParamAttr_value attribute for interactive
adjustment and then complete the adjustment with one set of the avParamAttr_e2value attribute.
It is advisable follow the example scenario presented in this document (see 3.3.5.3.1) when creating
user interfaces using the protocol.
Only the values between the minimum and maximum values (obtained using the get function) are
valid.
The set function on successful completion will return a successful reply packet. See “3.2.2.1 Success
Reply Packet”.
3.2.6 Get String
The get string function is used to obtain a string value. This may be used to convert the numeric value
into a string or it may be used to obtain information in the form of a string (in this case the get value
function will not be implemented).
The parameter request packet takes the following format:
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‘A’ ‘P’ ‘D’ paramID attribute Value ‘A’
Where
‘A’, ‘P’, ‘D’ are literal ASCII characters.
paramID is the parameter identifier. (see 3.2.1.2 Parameter Identifier)
attribute is the attribute identifier. (see 3.2.1.3 Attribute)
value is a value.
There is no difference between the avParamAttr_value and avParamAttr_e2value attributes. The
current recommendation is to set attribute to avParamAttr_value.
For the reply packet see “ 3.2.2.3 Success Reply Packet with string returned”.