Advantech B+B SmartWorx 232BSS4, Руководство пользователя

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12 Documentation Number 232BSS4-2916m
For instance, to ignore switching commands for 30 Seconds, send:
{Char1}{Char2} {Char3} ”T””7”
VB Example:
Ignore30s$ = CHR$(27) & CHR$(2) & “T” & “7”
Table 2.3 - Timer Values
Control Byte
(ASCII)
Control Byte
(Decimal)
Timer Setting
“0” 48 Timer disabled
“1” 49 10ms
“2” 50 25ms
“3” 51 100ms
“4” 52 500ms
“5” 53 1 s
“6” 54 5 s
“7” 55 30 s
“8” 56 1 min.
“9” 57 5 min.
Binary file transfer:
Two methods are provided in the 232BSS4 to prevent inadvertent
switching during a transfer of raw data bytes from the Master device to one
or more Slaves. Because the user doesn’t know if a command sequence is
imbedded in the raw data, the switch must be set to ignore commands.
Note that these procedures are not needed if the binary file will be
transferred from the Slave devices to the Master device. No switching
commands are used in the 232BSS4 with data from this direction, so no
inadvertent switching can occur.
Method1 – Ignore Commands For a Specific Length of Time
The first method is to ignore commands for a specific length of
time. This method is useful if the user knows how long the transfer will
take. The Master would first send the command to connect it to the
Slave port(s) that are to receive the data. Then the Master device would
send the “T” command along with the byte telling the 232BSS4 how
long to ignore commands. Once this is sent, data can be transferred to
the Slave(s) without the 232BSS4 looking for command sequences.
Once the timeout has been reached, the switch will continue looking for
commands and the Master can initiate the next communications
sequence.