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Configuring BSCI Ports 8-3
BSC Interactive Configuration
Line Speed
This Þeld speciÞes the data transmission rate in bits per second. If this port is a
physical DTE, specify the line speed that matches the speed of the device
connected directly to the port. If the port is a physical DCE (i.e., the attached I/O
cable is DCE) specify the clock speed of the serial port you are conÞguring. Valid
values for this parameter are: 75, 150, 300, 600, 1200, 2400, 4800, 9600, 14400, and
19200. The default value for this parameter is 9600.
Retransmission Period
This is the length of time (in milliseconds) before the FRX or SmartSwitch 1800
will retransmit a data frame if the previous transmission of that data frame was
not acknowledged. If the time expires, the timer will be reset, the data frame will
be retransmitted, and the Max Retransmissions counter (see below) will be
incremented.
The default value of 2000 milliseconds allows avoidance of unnecessary
retransmission of frames that have merely been delayed.
Max Retransmissions
This is the maximum number of times the FRX or SmartSwitch 1800 will attempt
to retransmit a data frame after the Retransmission Period (see above) expires. A
larger value for this parameter increases the probability of an eventual successful
transmission, but a smaller value permits faster detection of a permanent error
condition. The default value for this parameter is 5.
Start Sync Chars
This is the number of synchronization characters that will be added to the
beginning of each frame. The default value for this parameter is 2.
Trailing Pad Chars
This is the number of padding characters that will be appended to each frame.
This ensures that the last signiÞcant character is sent before the data transmitter
switches off. The default value for this parameter is 1.
Poll Interval
The amount of time (in milliseconds) between passes through the polling list. The
default value for this parameter is 500.
No Response Timer
This timer begins after the FRX or SmartSwitch 1800 transmits a general poll or a
data frame. It is the amount of time (in seconds) before the FRX or SmartSwitch
1800 transmits an NAK-EOT-General Poll sequence and increments the No
Response Retries count (see below). The timer will stop upon receipt of any valid
frame from the line. The default value for this parameter is 2.
No Response Retries
If a device is not responding to a poll, this count speciÞes how many times the
device will be polled before the general poll sequence bypasses the device and
moves on to the next one. The default value for this parameter is 5.