CAS X320, Руководство пользователя

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Communications Manual Rev 3.21 Software Versions 3.xx
Page 14
003R-618-321
4.1.1. Address Field
The address field is a two character hexadecimal field where:
Bit Field Name Description
7 Response Set by the slave to indicate that this message is a response
to a previous command.
6 Error Set to indicate that the data in this message is an error code
and not a normal response. Refer to Error Handling page
16.
5 Reply
Required
Set by the master to indicate that a reply to this message is
required by any slave to which it is addressed. If not set, the
slave should silently perform the command.
4 to 0 Indicator
Address
Valid unit addresses are 01
H
to 1F
H
(1 to 31 in decimal).
00
H
is the broadcast address. All slaves must process
broadcast commands. When replying to a broadcast, slaves
replace the broadcast address with their own address in this
field. Set in the indicator menus with SERIAL:ADDRES.
4.1.2. Command Field
The command field is a two character, hexadecimal field holding the id of command
to be performed. The following commands are defined to read register values or
properties:
Command Description
CMD_READ_TYPE Read Type of register.
CMD_READ_RANGE_MIN Read Minimum valid register value.
CMD_READ_RANGE_MAX Read Maximum valid register value.
CMD_READ_LITERAL Read Literal value of register.
Note: Value will be converted to final value as
required (eg. 2.000 kg G for gross weight).
CMD_READ_DEFAULT Read Raw default register value.
CMD_READ_MENU_TEXT Read Menu Text name shown on indicator display
during setup menus.
CMD_READ_ITEM Return item from list. Only valid for
TYPE_MENU, TYPE_OPTION and
TYPE_BITFIELD.
CMD_READ_PERMISSION Read Permission string.
CMD_READ_FINAL
Read Value of register converted to final value.
The following command is defined to write values to registers:
Command Description
CMD_WRITE_FINAL Write Final Value to register.
The following command is defined to execute on registers of TYPE_EXECUTE:
Command Description
CMD_EXECUTE Execute the function associated with a register.
4.1.3. Register Id Field
This is the four character hexadecimal register identifier. For the list of registers in
the instrument refer to Register Identifiers page 37.