Siemens SIMATIC TI505 Bedienungsanleitung Seite 54

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Seitenansicht 53
Modbus Commands
2-23
SIMATIC TI505/TI500 MODNIM User Manual
Diagnostic
Code — 03
0003 | Char 00
Diagnostic
code
Information frame
When
Function Code 08 uses diagnostic code 0003, the ASCII character
given in the information field is then used as the delimiter of an ASCII
mode message replacing the standard LF (line feed) character
.
NOTE:
A
void using the following characters as alternative ‘Ready’ field
markers:
:, 0
to
9
,
a
to
f, A
to
F,orCR
Y
ou also need to be aware that while the request must be sent with the
existing ‘ready’ character (default: LF), this response, and all future ones
will be returned with the new character until a RESET or a power cycle.
This code has significant effects on the operation of the MODNIM.
Diagnostic
Code — 04
0004 | 00 00
Diagnostic
code
Information frame
When
Function Code 08 uses diagnostic code 0004 and any value in the
information field (00 00 shown), the secondary node will be forced into
Listen Only Mode. In this mode, while the node may be listening to the
traffic on the network, it will only react to a Function 8, diagnostic code 01
command, which returns the MODNIM to normal operation. The MODNIM
also returns to normal operating mode if the RESET button is pressed or
the power is cycled. When the MODNIM enters Listen Only Mode, the
ONLINE indicator goes off.
This code has a significant effect on the operation of the MODNIM.
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