Imron Corporation
15375 Barranca Pkwy, Suite B-106
Irvine, CA 92618
Phone 949-341-0947
Fax 949-341-0949
INTEGRATED SYSTEM 2000 MR-DT DISPLAY TERMINAL
2. Wiring:
The MR-DT requires 12Vdc ±15% for power and the power source must be filtered.
The terminal communicates to a controller via a half duplex multi-drop 2-wire RS-485 interface. The total
cable length is limited to 4,000 feet (1,200 meters). Shielded cable of 24AWG with characteristic
impedance of 120 ohm is specified for the RS-485 interface. The last device on each end of the cable
should have the termination installed (set jumper DIP1=ON).
Alternatively, the terminal may communicate with a reader interface (MR-52) within a limited distance of
500 feet (152 meters) using an 18AWG cable.
J3 Color SIGNAL
1 RED 12Vdc IN
2 BLK GROUND
3 BLU RS-485 TR+ ---RS-485 connection
4 GRY RS-485 TR-
5 GRN TTL DATA, connect to MR-52 DATA 0
6 WHT TTL DATA, connect to MR-52 DATA 1 ---MR-52 connection
7 BRN TTL DATA, connect to MR-52 LED
8 ORG TTL DATA, connect to MR-52 BZR
9 RED 12Vdc PASS THROUGH FOR READER
10 GRN READER DATA (or DATA 0)
11 WHT READER CLOCK (or DATA 1) ---Reader Port
12 BRN READER LED
13 ORG READER BUZZER
14 BLK GROUND
3. CONFIGURATION:
Hardware Configuration
DIP4 DIP3 DIP2 DIP1 SELECTION
OFF RS-485 - No Termination
ON RS-485 - 120 Ohm Termination
OFF Use Configuration Settings
ON Forces 38400 baud & addr 31
OFF Allow software configuration at startup
ON Disble software configuration at startup
OFF NOT USED
DIP1: Proper termination practices must be followed to insure proper operation. If the MR-DT is the
last device on the RS-485 bus, termination should be set to ON.
DIP2: Used for testing. This DIP forces the baud rate and address to a known value.
DIP3: When set to ON, this disables the ability to use the keypad for changing the configuration.
This decreases the possibility of unauthorized persons from altering the configuration.
DIP4: Not used.
Jumpers
J1 Factory use only. Always open.
J4 Close pins 1-2 to allow flash upgrade of firmware. Open to disable.
