User`s guide

4: FMP Link Conﬁguration Options

DC 900-1339H 71

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

protocol parameter; for

example,

protocol = “FMP”. See Figure 5–1 on page 104.

4.5 Parity Option (6)

When using the ASCII/LRC-8 character set, this option controls the setting of bit 7 of

each character. Parity can be set to odd, even, or none (space parity for bisynchronous).

Any transmission containing a parity error is detected by the receiver hardware, and the

appropriate error recovery is taken by the FMP software. If no parity is selected, bit 7 is

set to zero for all transmitted characters when using bisynchronous line mode. Parity is

automatically disabled when the EBCDIC/CRC-16, ASCII/CRC-16, EBCDIC/CCITT-0

or ASCII/CCITT-0 character set is used. The parity used for bisynchronous transmis-

sion is normally odd.

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

parity parameter; for exam-

ple,

parity = “odd”. See Table 5–1 on page 104.

4.6 Character Set Option (7)

This option determines the character code for the FMP control sequences used on the

transmission line. It also determines what type of block checking is done on data

blocks. The character set option is valid only for the bisynchronous and structured

asynchronous line modes. The FMP software transmits all control characters on the

line with space parity when no parity is selected (Section 4.5).

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

charSet parameter; for

example,

charSet = “asciilrc8”. See Table 5–1 on page 104.

4.6.1 ASCII/LRC-8

When this setting is used, the FMP control sequences are transmitted in 7-bit ASCII

format, and LRC-8 block checking is performed.