11-6 Smart Switch 1800 4. 0 User Guide , Rev 0 1
Controller Type
A = Use this if you don't care or are not sure which type to select.
B = 2780 C = 3780 D = 3740 E = 27 70 F = 3770
Full Duplex
specifies full-duplex transmission (both directions at once). Currently, this must be
configured as Y.
# of Beginning Sync Chars
specifies the number of synchronizatio n characters that will be added to the beginning
of each frame.
# of Trailing Pad Chars
specifies the number of padding characters that will be added to the end of each fram e,
to ensure that the last significant character is sent before the data transmitter switches
off.
No Response Time r
is activated after transmission of a general poll or a data frame. On expiry, a NAK–
EOT–General Poll sequence is transmitted , and the No Response Retry Count is incre-
mented. The timer w ill be de-activ ated on reception of any valid frame from the line
during L ink Dow n.
No Response Retry Count
specifies how many times the user devic e will be polled (if it is not responding) before
control is passed on the next cluster (accompanied by other condition checks).
Delay Timer
is activated when the application queue is empty; i.e., when data from the network is
pendin g. On expi r y, a TTD (T e mpora r y Text De l ay) is se nt and th e timer i s re s t arte d.
After the final retry, an EOT is sent to the line, and a Clear Request is sent to the
network.
Delay Retry Count
specifies the number of times the node will retransmit a TTD when there is no data
pending from the network. Once the count reaches the specified value, the node will
issue an EOT and clear the virtual circuit.
NAK Retry Count
specifies the number of tim es the node will s end a frame when the r eceiving device is
unable to acknowledge; that is, returns a NAK to the node.
VC to be Cleared Afte r Disc
specifies whether the virtual circuit will be cleared after completion of a file transfer.
Idle Timer
is activated on reception of an EOT fr om the line. On expiry, an EOT is sent to the line
and a Clear Request is sent if VC to Be Cleared After Disc is Y.