User`s guide

38 DC 900-1406E

BSCTRAN Programmer’s Guide

Cautions:

1. The default ICP message buffer size for BSCTRAN is 1024 bytes. When the

BSCTRAN program is run, it sends a buffer conﬁguration command to set the

same size buffers on the ICP, only if this size is changed from 1024 with the

/DEFAULT command. There are two other buffer pools that must be configured for

BSCTRAN to work correctly. One buffer pool is used with the Freeway DLI rou-

tines. The size of these buffers is set in the DLI conﬁguration ﬁle. The second

buffer pool is the Freeway server buffers (if the Freeway server DLI is used). The

size of these buffers is set in the TSI conﬁguration ﬁle. Both these buffer sizes need

to be set to a size that includes the BSCTRAN buffer size and TSI header size. For

example, if the BSCTRAN buffer size is 1024 bytes, the DLI and TSI buffers

should be conﬁgured to 1200 bytes.

2. Users who wish to force larger blocks of data to be transmitted on the BSC com-

munications link should use the following commands after all links have been

disabled:

$ RUN BSCTRAN

BSC> DEFAULT /BUFSIZE=2048 ! Maximum is 4096

BSC> SET 2 spot /PAR8=2050 ! Transmission block size

BSC> SHOW 2 ! check your settings

The transmission block size should be BUFSIZE + 2 to allow for the STX and ETX

characters which the ICP inserts.

3. It is not necessary to change the transmission block size unless the user wants to

force blocks of an exact size on the BSC communications link. The ICP transmis-

sion block size is independent of both the ICP message buffer size and the

BSCTRAN write buffer size.

4. A

BUFSIZE of less than 1024 is not recommended.