141001UA
1-2
Operation
P
ATTON
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LECTRONICS
C
O
.
1084
I
NSTALLATION
A
ND
O
PERATIONS
M
ANUAL
“Switch on Data” Mode
To allow terminals that do not respond to RS and CS control leads to operate in a Multi-
Point or Point to Point network, the “Switch on Data” mode has been provided. When a
terminal sends data transitions, the 1084 (CTS LD-128K) will bring up its carrier and start to
transmit. When the data transitions stop for a period greater than the selected “No Data
Time-out” the carrier will drop and the 1084 (CTS LD-128K) will return to an idle state. CS
is constant when in “Switch on Data” Mode.
Clocking
Rates up to 128Kbps are internally generated by the 1084 (CTS LD-128K) for Transmit
clocking. Clocking may also be taken from an external device on the External Transmit
Clock Lead, pin 24, to facilitate tail circuit applications. To ensure synchronization of clock
through a system, Receive clock may also be utilized as the Transmit clocking source
(slave clocking).
Four Wire / Two Wire Operation
Half duplex 2 wire operation as well as 4 wire full duplex operation is selectable via
configuration switches.
Testing Modes
Local digital loop-back is easily selected via a front panel mounted switch. A positive visual
indication is provided when the 1084 (CTS LD-128K) is in loop-back mode. The data line is
looped bilaterally to allow both the local terminal and the remote terminal to be tested when
in 4 wire mode.
CTS Delays
CTS can be configured to respond to RTS regardless of the state of the transmitter. RTS to
CTS delays can be set to constant, 0mS, 8mS or 50mS.
Anti-Streaming
When a terminal in a Multi-drop network fails, with the RS signal lead active, the attached
LD-128K will remain transmitting. This “Streaming” terminal will cause the entire network to
fail. To prevent this type of failure, the 1084 (CTS LD-128K) provides Anti-Streaming
protection. When Anti-Sreaming is enabled, the control logic will turn off the 1084’s (CTS
LD-128K) transmitter after seeing an RS signal for the selected period of time. The
transmitter will not turn on again until the RS signal is released by the terminal.