Return Values Of Mailbox Commands - WAGO I/O-SYSTEM 750 Manual

WAGO-I/O-SYSTEM 750
®
750-644 Bluetooth RF-Transceiver
12.2

Return Values of Mailbox Commands

The following standard values are defined for the return values (MBX_RESULT)
of mailbox commands:
Label
MBX_CMD_OK
MBX_CMD_GENERAL_ERROR
MBX_CMD_DENIED_UNKNOWN
MBX_CMD_OUT_OF_RANGE
MBX_CMD_INVALID_ARG
MBX_CMD_INTERNAL_ERROR
MBX_CMD_TIMEOUT
MBX_CMD_DENIED_NOT_APPLICABLE
MBX_CMD_DENIED_NOT_IMPLEMENTED
MBX_CMD_DENIED_MBX_TOO_SMALL
MBX_CMD_DENIED_BUSY
MBX_CMD_INVALID
All Mailbox commands use these return values to signal the status of the
command execution. If individual return values offer additional interpretations for
specific Mailbox commands, this is explained in more detail in the description of
the respective command.
In principle, the first return value with a mirrored mailbox command and toggle
bit is considered a valid response. As soon as this happens, the next mailbox
command can be executed. Many commands result in a restart of the 750-644 I/O
module. If a Mailbox command that triggers a restart is not replaced by another
command after receiving the response, the 750-644 I/O module recognizes the
unaltered, existing command when it restarts. The command is rejected with
MBX_CMD_DENIED_BUSY to prevent an endless loop of resets. This offers
the possibility of determining the successful conclusion of a reset by monitoring
change of the return value.
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Manual
Version 2.0.0, valid from FW/HW Version 03/03
Return Description
value
0x00 Successful execution
0x01 General error
0x02 Unknown command
0x03 Values outside of the valid range
(overrun or underrun)
0x04 False or invalid argument
0x05 Internal error
0x06 Time overrun of the command
0x07 Prerequisites for command not
fulfilled: false operation mode,
false device role or necessary
precursor command not executed
0x08 Command reserved for later
implementation
0x09 Mailbox too small for return
value
0x0A Current or precursor command
being executed, no valid data is
available yet. Recommendation:
call up command again after a
short waiting period.
0x0B System or network configuration
is defective
Appendix 137