GE EP-5261 User Manual page 7

Serial communication module
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RSTi-EP Slice I/O Serial Communication Module
Byte
Format
QB0
Word
QB1
Word
QB 2 ... QB 7
or
QB 2 ... QB 15
Process Output Data
Name
Bit
Description
IX0.0
RXBUF FLUSH
IX0.1
TXBUF FLUSH
IX0.2
RX_HWBUFFER
Status and
Diagnosis
IX0.3
TX_CNT
IX0.4
TX_CNT
IX0.5
RX_CNT_ACK
IX0.6
RX_CNT_ACK
Communication
IX0.7
Status
Length of the
data segment
User data of the
Transmission
transferred
data
telegram segment
For public disclosure
Remarks
Bit 0: RXBUF FLUSH
The receive memory can be scrubbed using
this bit.
STATRES = 1: A requirement with RXBUF FLUSH
= 1 will be ignored.
STATRES = 0: The receive memory will be
scrubbed with RXBUF FLUSH = 1.
Bit 1: TXBUF FLUSH
The emission memory can be scrubbed using
this bit.
STATRES = 1: A requirement with TXBUF FLUSH
= 1 will be ignored.
STATRES = 0: The emission memory will be
scrubbed with TXBUF FLUSH = 1.
Bit 2: DisableSend_TX_HWBUFFER
This bit controls the hardware emission
memory:
DisableSend_TX_HWBUFFER = 0: The hardware
emission memory is released. A character
(Byte) will be sent as soon as it reaches the
buffer.
DisableSend_TX_HWBUFFER = 1: The hardware
emission memory is locked. Characters (Bytes)
will only be sent, when
DisableSend_TX_HWBUFFER is set to 0 again.
The TX_CNT value is assigned to each data
segment of the process output data. The
sequence or the TX_CNT values is:
Binary: 00–>01–>10–>11–>00...
Decimal: 0–>1–>2–>3–>0...
A faulty data sequence indicates missing data
segments.
RX_CNT_ACK must include a copy of the
RX_CNT value. The RX_CNT value has been
transferred together with the last data
segment of the process input data.
RX_CNT_ACK must be set in analogy with
RX_CNT (in the status byte). It indicates that the
data segment has been transferred
successfully by using RX_CNT and enables to
receive new data.
The input data status bit STAT will be reset
using this bit. When changing from 1 to 0
(falling edge) STAT will be reset from 0 to 1.
STAT = 0: All changes in the data fields
TX_BYTE_CNT, TX_CNT and RX_CNT_ACK will be
ignored. The receive or emission memory can
be scrubbed using RXBUF FLUSH or TXBUF
FLUSH respectively.
STAT = 1 or changing from 0 to 1: The buffers
cannot be scrubbed.
7
GFK-2992B

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