Patton electronic 2085 User Manual

Page 9

4.2.2 DAISY CHAIN TOPOLOGY

Using a daisy chain topology, you may connect several Model

2085s together in a master/slave arrangement. Maximum distance
between the units will vary based upon the number of drops, data rate,
wire gauge, etc. Call Technical Support for specific distance estimates.

Figure 8 (below) shows how to wire the two-pair cables properly for

a Model 2085 daisy chain topology. Note that the ground connection is
not needed.

4.3 CONNECTION TO THE RS-232 INTERFACE

Once you have properly configured the Model 2085 and connected

the twisted pair wires correctly, simply plug the Model 2085 directly into
the DB-25 port of the RS-232 device. Remember to insert and tighten
the two captive connector screws.

(Note: If you must use a cable to connect the Model 2085 to the

RS-232 device, make sure it is a

straight through

cable of the shortest

possible length—we recommend 6 feet or less).

4.4 OPERATING THE MODEL 2085

Once the Model 2085 is properly installed, it should operate

transparently—as if it were a standard cable connection. Operating
power is derived from the RS-232 data and control signals; there is no
“ON/OFF” switch. All data signals from the RS-232 and RS-485
interfaces are passed straight through. Additionally, one hardware flow
control signal is passed

in each direction

APPENDIX A

PATTON MODEL 2085 SPECIFICATIONS

Transmission
Format:

Asynchronous

Data Rate:

Up to 115,200 bps

Range:

Up to 9 miles

RS-232 Interface:

DB-25, male or female (DCE/DTE
switchable)

RS-485 Interface
Options:

DB-25, male or female; RJ-11 or RJ-45 jack;

terminal block with strain relief

Transmit Line:

2, 4 wire unconditioned twisted pair

Transmit Mode:

4-wire, full or half duplex; 2-wire half duplex

Control Signals:

DSR turns “ON” immediately after the
terminal raises DTR; DCD turns “ON” after
recognizing the receive signal from the line;
CTS turns “ON” after the terminal raises
RTS.

RTS/CTS Delay:

8 mSec or “no delay”

Carrier:

The carrier is switch selected either
continuous operation or switched operation,
controlled by RTS

Surge Protection:

600W power dissipation at 1 mS

Power:

Draws operating power from RS-232 data
and control signals; no AC power or
batteries required.

Temperature:

0 to 50º C

Humidity:

5 to 95%, non-condensing

Size:

2.66” x 2.10” x 0.73”

HOST

FIRST SLAVE

OTHER SLAVE(S)

XMT+---------------------RCV+ -----------------------RCV+
XMT- ---------------------RCV- -----------------------RCV-
RCV+---------------------XMT+ -----------------------XMT+
RCV- ---------------------XMT- -----------------------XMT-

Figure 8. Daisy chain wiring for Model 2085 host and slaves