User`s guide

70 DC 900-1339H

FMP Programmer’s Guide

4.2.2 Internal

When the internal clock setting is used, the clock signal is generated at the rate speciﬁed

in the data rate option (Section 4.1). The generated clock signal is used for transmit

clocking and is output on the terminal timing signal (EIA-232 pin 24). Receive clocking

is input through the receiver timing signal (EIA-232 pin 17). The transmitter timing

signal (EIA-232 pin 15) is not used. Your Freeway server is factory conﬁgured for

external clocking using a hardware jumper. If you need to set internal clocking, call the

Simpact customer support number given in the Preface.

4.3 Number of Leading SYN Characters Option (4)

This option speciﬁes the number of SYN characters to precede all transmitted data

blocks. Certain links may require more SYN characters to ensure synchronization on

poor-quality lines. The minimum number of leading SYN characters is two; the maxi-

mum number is eight. SYN characters are not added to unstructured asynchronous

transmissions.

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

numLeadSync parameter; for

example,

numLeadSync = 3. See Table 5–1 on page 104.

4.4 Protocol Option (5)

This option indicates the protocol used on the ICP and has only one setting (FMP).

This setting is reported in the conﬁguration report (Section 3.4.2.2 on page 54) which

may be used by client application programs to verify the protocol running on the ICP.

The DLI conﬁguration program (Chapter 5) considers this protocol option to be pro-

tocol-independent, but it must be set to

“FMP” in order to select the FMP protocol. This

parameter must be set prior to any attempt to assign another FMP conﬁguration option

within a session deﬁnition (see Figure 5–2 on page 103); otherwise the DLI conﬁgura-

tion program will fail.