System Monitor
Counter Name
What gets counted
Access counter by using
Function D i a g n o s t i c
code c o d e
Message
All messages received by the
Serial Interface
8
1
1
Communications
Error
Framing, parity or CRC errors
8
1
2
Character Overrun
Error
Overrun errors that occur on
received messages
8
1
8
Exception
Messages that result in an
exception response
8
1
3
80175-01
16
PROTOCOL SPECIFICATIONS
MODBUS PROTOCOL DIAGNOSTIC COUNTERS
There are four diagnostic counters and one diagnostic register which are maintained by the Serial
Interface when implementing the Modbus protocol. Each of these counters and the diagnostic
register may be accessed via the Loopback/Maintenance function code 8.
Note
All counters get reset on power-up or
by receiving a function code 8, diagnostic
code 10 command.
46
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Summary of Contents for 3300/01 Series
Page 2: ...3300 01 SYSTEM MONITOR OPERATION MANUAL BENTLY re NEVADA PART NO 80175 01 ...
Page 5: ...System Monitor 80175 01 Blank Page iv ...
Page 7: ...System Monitor 8 0 1 7 5 0 1 Blank Page vi ...
Page 58: ... System Monitor 80175 01 18 SCHEMATICS AND DRAWINGS 51 ...
Page 59: ... 5 Z 5 s 0 0 3 T4 E a 1 p L SERIALINTERFACE SCHEMATIC SHEET 1 OF 4 ...
Page 62: ... T 7 1 0 1 0 z g i i IS P ig SERIAL INTERFACE SCHEMATIC SHEET 4 OF 4 ...
Page 64: ... I I ...
Page 67: ... SYSTEM MONITOR SCHEMATIC SHEET 3 OF 6 ...
Page 73: ...t ...