User`s guide

4: FMP Link Configuration Options
DC 900-1339H 69
Therefore, if FMP is being used to transmit data, the data rate should be set to match,
or be slower than, the modem clock rate.
The data rate on a link can be set from 75 through 56,000 bits/second. When using data
rates above 19,200 bits/second, be careful not to overload the communications server
processor. Freeway supports up to16 links per ICP, and the maximum link data rates
are:
• 1 link at 56,000 b/s
• 4–8 links at 19,200 b/s
• 16 links for a 16-port ICP at 9,600 b/s
To set this option using the DLI configuration file, use the
dataRate parameter; for
example,
dataRate = 9600. See Table 5–1 on page 104.
4.2 Clock Source Option (2)
The clock source option determines the source of the data clock signals for a link. Data
clocking can be provided by the FMP software or received from an external source.
To set this option using the DLI configuration file, use the
clockSource parameter; for
example,
clockSource = “external”. See Table 5–1 on page 104.
4.2.1 External
Simpact recommends the external clock setting for most communications applications
that involve a cable length greater than 25 feet. With the external setting, the clock gen-
erator is disabled, and data clocking must be supplied by an external source such as a
modem or modem eliminator. Receive clocking is input through the receiver timing
signal (EIA-232 pin 17), and transmit clocking is input through the transmitter timing
signal (EIA-232 pin 15). Your Freeway server is factory configured for external clocking
using a hardware jumper.