Comtech-ef-data PCB-4000 Manual do Utilizador descarregar pdf (Página 53)

PCB-4000 1+1 Phase Combiner Revision 2

Serial Remote Control MN/PCB4000.IOM

5–5

5.2.2.5 Instruction Code

This three‐character alphabetic sequence  identifies the subject of the message. Wherever  possible, the instruction codes have been

chosen to have some significance. This aids in the readability of the message if seen in its raw ASCII form. Upper and lower case

alphabeticcharacters(i.e.,A‐Z[ASCIIcodes65‐90],an

da‐z[ASCIIcodes97‐122])maybeused.

5.2.2.6 Instruction Code Qualifier

Thissinglecharacterfurtherqualifiestheprecedinginstructioncode.



CodeQualifiersobeythefollowingrules:



1. FromController‐to‐Target,theonlypermittedvaluesare:

Symbol Definition

(ASCII code 61)

‘=’ is used as the assignment operator, and is used to indicate that the parameter defined by the preceding byte should be set to the

value of the argument(s) that follow it. For example: MUT=1 would mean 'enable the Mute function.'

(ASCII code 63)

‘?’ is used as the query operator, and is used to indicate that the Target should return the current value of the parameter defined by

the preceding byte. For example: MUT? Would mean ‘return the current state of the Mute function.’



2. FromTarget‐to‐Controller,theonlypermittedvaluesare:

Symbol Definition

(ASCII code 61)

The = code is used in two ways:

First, if the Controller has sent a query code to a Target (for example: MUT? would mean ‘return the current state of the Mute

function’), the Target would then respond with MUT=x, where ‘x’ represents the state in question (1 being ‘enabled’, 2 being ‘disabled).

Second, if the Controller sends an instruction to set a parameter to a particular value, then, providing the value sent in the argument is

valid, the Target will acknowledge the message by replying with MUT= (with no message arguments).

(ASCII code 63)

The ? code is only used as follows:

If the Controller sends an instruction to set a parameter to a particular value, then, if the value sent in the argument is not valid, the

Target will acknowledge the message by replying (for example) with MUT? (with no message arguments). This indicates that there

was an error in the argument of the message sent by the Controller.

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