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3040/V35
139001UA
1-2
INSTALLATION AND OPERATIONS MANUAL
OPERATION
PATTON ELECTRONICS CO.
Anti-streaming
A typical problem often encountered is a “
STREAMING
” remote terminal. The streaming
problem can tie up an entire circuit until the offending device has recovered or is powered
down. A streaming condition occurs when a Sub-Channel remains active, disrupting the
polling sequence. The 3040/V35 (CTS MD-V.35/TCB) provides two user selectable modes of
controlling a streaming condition, an automatic anti-streaming Abort Timer with eight
selectable block lengths and a setting to disable anti-streaming for large data block transfers,
and a manual Operator Control mode (front panel push button switch).
Automatic Anti-streaming
- Automatic Anti-Streaming will block the asserted control signal
from the Sub-Channel Port, releasing the 3040/V35 (CTS MD-V.35/TCB) to accept requests
from any other Sub-Channel that has not been locked out due to a streaming condition. When
a Sub-Channel is locked out for streaming, a visual indication, by Sub-Channel, is provided on
the front panel.
The Sub-Channel will no longer receive data or CTS from the Master Port.
Any data sent to the Master Port by the streaming device will be lost
. Once a Sub-Channel is
locked out due to streaming, the Sub-Channel will remain locked out until the attached device
removes the streaming condition. If RTS is held active, RTS must become inactive, if
continuous data transitions have triggered the Anti-Stream logic, the transitions must stop
before the 3040/V35 (CTS MD-V.35/TCB) will clear the Anti-Stream logic to that Sub-Channel.
Removing the Sub-Channel via the front panel disable switch will not clear the Anti-stream
logic for a Sub-Channel once it has been activated.
Manual Anti-Streaming
- If manual Anti-Stream protection is chosen, a streaming condition
caused by one of the attached terminals can be quickly corrected by the 3040/V35 (CTS MD-
V.35/TCB) via the associated front panel locking switches. A switch is provided for each Sub-
Channel and permits the rapid removal of a streaming terminal without having to disconnect
any cables or power down the offending terminal. Terminals may be selectively removed for
self-test and maintenance without affecting the remaining Sub-Channels. Once the streaming
condition has been corrected, the front panel switch is simply depressed to the locked
(Enable) position (Green indicator ON) to re-establish normal operation. Removing a Sub-
Channel with the front panel switch will block data from the Sub-Channel going to the Master
Port but will not block data going from the Master Port to the Sub-Channel as the Automatic
Anti-Stream option did.
Channel Selection Modes
The 3040/V35 (CTS MD-V.35/TCB) provides two selectable Sub-Channel service modes of
operation, the Scanning Mode and Priority Mode. Depending on system requirements, either
mode may be selected by internal DIP switch settings. Both modes switch on activity from the
Sub-Channel.