Siemens GC..M.. Bedienungsanleitung PDF herunterladen (Seite 10)

http://www2.merrick-inc.com/mct/GCMModbus.pdf Page 10 2014-05-18/Lars

Rxsta

Character receiver state enumeration:

0 Waiting for first UART interrupt

1 Not used in Modbus

2 Buffering data

3 Not used in Modbus

4 Waiting for second end character (ModBus ASCII)

5 Received telegram complete on delimiters (ModBus ASCII)

6 Received telegram complete on UART timeout or intrinsic length (ModBus RTU)

7 Not used in Modbus

8 Not used in Modbus

Txsta

Character transmitter state enumeration:

0 Idle

1 First character in UART, RS422 transmitter enabled

2 Ongoing transmission from ISR

3 Last byte of telegram placed in UART FIFO

4 Waiting for UART transmitter empty to disable the RS422 transmitter

State

Communication task state enumeration:

0 Not used

1 Initializing (transient)

2 Waiting for some characters received

3 Waiting for end-of-telegram condition

4 Handling message

5 – 8 Not used in Modbus

isTimeout

No valid telegrams have been received for MaxTime (see above), and MaxTime is

greater than zero.

addr

Starting Word in last CIT read or write telegram. Typically 16 or 44.

size

Number of Words in last CIT read or write telegram

cmd

Telegram command enumeration. Protocol dependent. For Modbus:

3 for Read Multiple Registers, 16 for Write Multiple Registers, 8 for Diagnostics

subf

ModBus telegram 8 subfunction. Only subfunction 0 (echo data) is supported.

cCRC

Calculated CRC in incoming telegram.

tCRC

CRC field in incoming telegram. Must be equal to cCRC for valid checksum.

bcnt

Byte count field in incoming and outgoing ModBus telegrams

lalen

Number of characters in the last completed incoming telegram

rtgms

Counter for incoming telegrams. This includes all telegrams with a valid end

condition

htgms

Counter for handled telegrams. This includes all telegrams addressed to this GCM,

correctly formatted, with a correct checksum.

ttgms

Counter for transmitted telegrams

NotMe

Counter for received, correctly formatted telegrams not addressed to this GCM

rxcse

Counter for received telegrams with checksum errors

rxfme

Counter for received, incorrectly formatted telegrams. See rxlfm below

rxlfm

Last encountered received format error enumeration. Protocol dependant. Note 1.

timee

Counter for isTimeout. Increments every time isTimeout goes from False to True

LenEnd

Counter for ModBus RTU telegrams who have had the end condition determined by

the content of the length determining fields within the telegram

TimEnd

Counter for ModBus RTU telegrams who have had the end condition determined by

UART character timeout

1 2 ... 5 6 7 8 9 10 11

Transmit 7

Kommentare zu diesen Handbüchern

Keine Kommentare

Siemens GC..M.. Bedienungsanleitung Seite 10

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Nein Siemens GC..M..