Prosoft-technology MVI56E-GSC/ GSCXT Manual de usuario descargar pdf (Pagina 91)

MVI56E-GSC ♦ CompactLogix or MicroLogix Platform Reference

Enhanced Generic ASCII Serial Communication Module User Manual

ProSoft Technology, Inc. Page 91 of 140

May 9, 2014

Port 2

Byte Offset

Description

251 to 252

Number of characters (0 to 200) in Port 2 receive block (255 to 454). If the receive

data in the module is larger than 200 bytes, multiple blocks will be transferred. Any

block with a value of -1 in this field represents the first or continuation block and the

block contains 200 bytes of data. The last block of data will contain a positive

number in this field that represents the number of characters in the last block.

253 to 254

Number of characters transmitted (0 to 200) from last block write Port 2

255 to 454

Port 2 data received

455

Reserved

Port 2 Status

Byte Offset

Description

456 to 457

Port 2 receive state:

-1 = Listening for data

1 = Receiving Port Data

2 = Waiting for Backplane transfer

458 to 459

Port 2 receive character count

460 to 461

Port 2 receive block count

462 to 463

Port 2 transmit state:

0 = Waiting for Data to Send

1 = RTS On

2 = RTS Timeout

3 = Sending data

4 = Waiting for RTS Off

5 = RTS turned off

30 = Intercharacter Delay

31 = Intercharacter Delay

32 = Intercharacter Delay

100 = Message Delay before Transmit

101 = Message Delay before Transmit

464 to 465

Port 2 transmit character count

466 to 467

Port 2 transmit block count

468 to 469

Port 2 error word

470 to 498

Reserved

499

Block Sequence Number (Bumped each scan by module)

The Block Sequence Number (byte 499) is an index value used to signal to the

ControlLogix processor that a new block is ready for ladder logic processing. The

ladder logic must recognize a change in this value and process the data

encapsulated in the input image.

The read block contains the data received on each port and status data for each

port. The two word-length values at bytes 1 & 2 (Port 1 Receive Length) and 251

& 252 (Port 2 Receive Length) define the number of bytes in this input image to

be processed by the ladder logic for each port. Received data for the ports are

found starting at byte 5 for Port 1and 255 for Port 2.

1 2 ... 86 87 88 89 90 91 92 93 94 95 96 ... 139 140

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