Light Engineered Displays LI Loop Converter Interface User Manual

LI-125 LOOP
CONVERTER

Graphic Annunciators * Water Leak Detection
Fireman’s Smoke Control Panels * ARA Systems

109 Portwatch Way Wilmington, N.C. 28412 Phone: [phone] Fax: [phone]

Internet: www.ledinc.com Email: [e-mail]

Technical Specifications

1. POWER
10 to 50 vdc @ 500 ma max.

2. OPERATING TEMPERATURE
32° - 100° F

3. HUMIDITY
0% - 100° Non-condensing

4. COMMUNICATIONS
20 ma Loop

Model LI-125

LI

SERIES

General Description

The model LI-125 is designed specifically to facilitate communications between the Cer­berus XL-3 Addressable Fire Alarm System and peripheral devices such as CRT monitors
and printers. The LI-125 provides selectable answer-back codes so that the Fire Alarm
System can supervise the data loop. When used in a CRT/Keyboard and printer combina­tion, full system control can be obtained allowing for replacement of the standard RC-119
printer. Note: when multiple terminals are connected, ONLY ONE may provide the answer­back codes.

With the answer-back codes disabled, the LI-125 provides a means to connect a CRT moni­tor on a loop with an existing RC-119 printer.

The LI-125 supports a serial output for connection to any Wyse 50 compatible monitor and
a parallel output for connection to any IBM compatible printer. The unit features DIP switch
selectable supervision of its peripherals. When enabled, the connected device(s) must be
fully operational and ready for data, or a “loop trouble” will be generated at the XL-3 control
panel. Diagnostic indicators for power, loop, CRT, and printer status expedite troubleshoot­ing.

Custom software traps ALL supervisory bitstream characters to allow for proper operation of
attached devices. Your CRT “Screen Saver” will be fully functional. Also, a software com­mand causes the attached printer to empty its buffer to insure all messages are printed.

LI-125 LOOP

LI

SERIES

CONVERTER

General Description & Wiring

The LI-125 Interface may be located 1000’ from the XL-3 Control Panel. The printer and CRT plug into the
LI-125 using standard computer cables. The devices should be located within 50’ of the interface.

DIP Switch Designations

1. This switch is “closed” to supervise for CRT.
“Open” switch to defeat supervision.

2. “Close” switch to supervise printer.
“Open” switch to defeat supervision.

3. “Close” switch to emulate RC-119

4. “Close” switch to activate answer-back.
If answer-back is provided by other device,
then switch must be “Open.”

5, 6, 7 Not Used.

8. Must be “Closed” when used with both a
printer / CRT combination, “Closed” for
printetr only, & “Open” for CRT only.

1 2 3 4 5 6 7 8

Disable CRT Alarm

Dip SW
Program
Options

Monitor
LEDs

Disable Printer Alarm
Answer Mode
Answer Enable

Not Used

1

Current LP REC

2
3

Current LP XMIT

4
5

Sys Run

6
7

Printer Alarm

8
9

CRT Alarm

10
11

Power On

12

Circuit Board

Slot 3 (J3)
MBX-1 in
First Enclosure

1 2 3 4 5 6 7 8 9 10 11 12 13

Not Used

RS-232
Terminal

Printer Port
Centronics

Transmit -

Receive -

Recieve +

Transmit +

14 15 16

12 VDC Pwr In

Relay*

+

-

N.O.
N.C.

Comm

Plug-In Transformar
115 VAC to 12 VDC @ 500 ma.

­Receive

+

-

+

Transmit

*OUTPUT: Emulation: Wyse 50

Baud Rate: 9600
Parity: ODD
Data Bits: &/1
Full Duplex

*Relay can be used to activate local fault audible device.

Contacts are related at .5 amps at 115 VAC.