Sierra Video VS User Manual download pdf (Page 55)

GENERIC PROTOCOL

This says that input 5 is to be connected to output 1 on all levels and input 6 is to be connected to

output 2 on level 3, after a delay of 5 fields from the beginning of the field that follows receipt of

the “!” character.

Basic “G” Command:

Action From Syntax

Modify Host G command_name { arguments… } ~

Query Host G command_name { arguments… } ~

Query Response Router G command_name { arguments… } ~

Modify is Protected: Yes

Report Changes: No

The command "G" is used to query or modify a router configuration parameter or parameters.

Summary lines at the start of each command section describe, for each type of command action

(Modify, Query, or Query Response), whether the command is sent to the router or from the

router and what the syntax of the command is. They also indicate whether or not the modify form

of the command is password-protected or not (“Modify is Protected”) and whether or not the

command participates in automatic reporting of parameter changes (“Report Changes”) as

described under the “G REPORT_CHANGES” command.

Each command has three possible syntax forms:

Modify: this form is sent to the router to modify a parameter value

Query: this form is sent to the router to query for a parameter value

3. Query Response: this form is sent by the router to report the value of a parameter in

response to receiving a Query or in response to a change in the parameter value when automatic

reporting of parameter changes is turned on.

Generally, the command arguments identify the parameter that is being queried or modified, and

provide its new value if it is being modified. The first argument following the “G” command

character is a command name. Additional arguments may be required for some command

names to completely specify the parameter in question. After those, one or more additional

optional arguments may give a new value for the parameter. All arguments are separated from

one another by commas.

When the Modify form of the command is used and if the new value is a valid value, the router will

change the parameter value to this new value, providing that “Modify is Protected” says “No” or

the administrator password has been sent using the “K” command. It will then report the new

value to all router control ports that have requested these reports, providing that “Report

Changes” says “Yes”. If a new value is provided that is an illegal value, the parameter is left

unchanged and no “G” command is sent.

When the Query form of the command is used, the Query Response form of the command is

returned to the control port that sent the Query command, reporting the current value of the

parameter. The Query form of a command is normally the same as the Modify form except that

the new parameter values are not included. The Query Response form of a command is normally

the same as the Modify form (but of course the sender and receiver are reversed in these two

cases).

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Sierra Video VS User Manual Page 55