User`s guide

4: FMP Link Conﬁguration Options

DC 900-1339H 73

characters. For example, a transmission block size of 512 bytes consists of 510 bytes of

data plus two control characters (SOH and ETX). SYN, DLE, PAD, and BCC characters

are not included in the transmission block size count. The FMP software automatically

inserts all control characters in the blocks sent and removes them from blocks received.

If the remote station sends a transmission block that is larger than the conﬁgured size,

the FMP software sends the

DLI_ICP_ERR_BUF_OVERFLOW buffer overrun error to the cli-

ent with all the data that was received.

The size of message buffers from the client is independent of the transmission block

size. The ICP message buffer size is controlled by the Set ICP Message Buffer Size com-

mand (Section 3.4.1.3 on page 48). Messages to be transmitted that are greater than the

transmission block size are broken into smaller messages and sent separately. See

Section 2.1.6 on page 32 for more information on transmission blocks.

For messages received on the communication line, the ICP message buffer size is the

maximum size that can be received; otherwise, the

DLI_ICP_ERR_BUF_OVERFLOW error

code is sent to the client application.

To set this option using the DLI conﬁguration ﬁle, use the

transBlkSize parameter; for

example,

transBlkSize = 512. See Table 5–1 on page 104.

4.8 Data Translation Option (10)

This option invokes transmit and receive data translation using one of the three

onboard ASCII translation tables described in Appendix B.

When one of the translation tables is selected, data translation is enabled. Data blocks

from the client are treated as ASCII data and are translated into EBCDIC or Baudot

code before they are transmitted on the communication line. Conversely, data blocks

received from the line are treated as EBCDIC or Baudot code and are translated to

ASCII before they are sent to the client. No translation is done on transparent data

blocks.