Comtech EF Data UT-4518E Especificações descarregar pdf (Página 91)

UT-4500-A Series Upconverters Revision 0

Appendix A MN-UT4500A

A–5

A.5.6 Bus Inactivity Requirement

Comtech EF Data recommends that a minimum of 50 milliseconds bus inactivity be provided by

the user between the receipt of a response from an addressed converter and issuing the next

command on the serial bus.

A.6 Message Structure

The structure of a Command, Response, or Error Message is as follows:

! Start Character

! Device Address

! Command or Response

! End of Message String

A.6.1 Start Character

The Start Character begins each message:

Example: < Start of a user Command.

> Start of a converter response.

A.6.2 Device Address

The Device Address consists of a Physical Address or a Physical Address and an appended

Virtual Address. For this document DEV is used for the generic case examples.

Example: <3V12

A.6.3 Command

A Command is a variable length character string beginning with a forward slash “/”’ and

containing either an instruction or an instruction and data for a converter to act upon. If data is

passed by command it is appended to the instruction by an underscore “_”. If data is retrieved by

command underscore follows the instruction flagging the converter to supply data in a response.

Note: In this appendix, “/COM” is used for the generic case examples.

Example: <DEV/COM_xxx'cr' (Sends data to a converter.)

Example: <DEV/COM_'cr' (Requests information from a converter.)

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Comtech EF Data UT-4518E Especificações Página 91