141001UA
1-1
Operation
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ATTON
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LECTRONICS
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O
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1084
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NSTALLATION
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ND
O
PERATIONS
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ANUAL
CHAPTER 1 - OPERATION
The 1084 (CTS LD-128K) is an RS-232 Line Driver. This device is a cost effective solution
for interconnection of Synchronous or Asynchronous, Point to Point, or up to 32 Multi-Point,
terminal devices. (Distances of up to 4000 feet, at 128Kbps may be acheived, using 24ga.
wire.)
Front Panel
The power indicator, marked PW on the front panel is green and indicates when AC voltage
is applied to the unit. The two adjacent green LED indicators illuminate in conjunction with
Send Data (SD) and Receive Data (RD). Request to Send (RS), Clear to Send (CS),
Carrier Detect (CD) and Anti-Stream (AS) status LED’s are also provided to give a clear
visual indication of the 1084’s (CTS LD-128K) operational status. The Digital Loop Back
switch provides a convient means to verify operation of the data communication circuit.
When the button is not depressed (BLACK), the 1084 (CTS LD-128K) operates normally,
providing communication from end to end. When in (YELLOW), the 1084 (CTS LD-128K)
provides bilateral looping to facilitate testing of the line driver and communication circuit
from either end.
Point to Point / Multi-Point Operation
The 1084 (CTS LD-128K) utilizes RS-485 tristate drivers and receivers. Both Switched
Carrier and Constant Carrier operation are possible. When Switched Carrier is selected, up
to 32, 1084 devices may be connected together to form a Multi-Drop network. Distance from
the master 1084 to the last 1084 in the network are dependent on data rate selected and the
gauge of wire used to connect the units. The higher the data rate and thinner the gauge of
wire used, the shorter the communication distance possible. During Constant Carrier
operation, the 1084’s are connected in a point to point configuration. As with Multi-point
operation, the higher the data rate and thinner the gauge of wire used, the shorter the
communication distance possible. The 1084 can also be used point to point in the switched
carrier mode.
PW TD RD RS CS CD
AS
DIGITAL
LOOPBACK
1084
