User`s guide

160 DC 900-1340I
BSC Programmer’s Guide
6.2.1 External
Protogate recommends the external clock setting for most communications applica-
tions that involve a cable length greater than 25 feet. In the external setting, the clock
generator is disabled. Data clocking must be supplied by an external source such as a
modem or modem eliminator. Receive clocking is input through the receiver timing sig-
nal (EIA-232 pin 17), and transmit clocking is input through the transmitter timing sig-
nal (EIA-232 pin 15). Your Freeway server is factory configured for external clocking
using a hardware jumper.
6.2.2 Internal
When the internal clock setting is used, the clock signal is generated at the rate specified
in the data rate option (Section 6.1). 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 sig-
nal (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 Protogate
customer support number given in the Preface.
6.3 Reply Timer Length Option (3)
The reply time is the length of time in seconds that the BSC 2780/3780 software waits
for the remote station to reply to a transmission. The transmission may be a poll, select,
or data block. If the remote station does not respond within the timeout period, the
BSC software repeats the transmission up to the number of times allowed by the retry
limit option (Section 6.13) before aborting with the
DLI_ICP_ERR_RETRY_EXCEEDED retry
limit error. This option also controls the length of time BSC waits in receive mode
before sending ENQ to the remote station.
To set this option using the DLI configuration file, use the replyTimerLen parameter; for
example,
replyTimerLen = 3. See Table 7–2 on page 191.