INTRODUCTION:
Milestone model LD-15U is a RS232, to RS422/RS485 converter is designed for high-speed data transmission between computer system
and or peripherals over Iong distance under high noise conditions.
They provide dual line interface per signal.
APPLICATIONS:
Application for these converters can be for factory automation,
Programmable logic controllers,, attendance recording systems,
Barcode Readers, remote data transmission, remote terminals, EPABX etc.
SPECIFICATIONS:
Input: RS232-T×D, R×D, DSR (for control), GND (D9 Female connector)
Output: RS422/RS485-Tx+, Tx-, Rx+. Rx-(D9 Male Connector). Each signal is protected by spike
suppressor, fuse and has opto-isolation.
Selection Switch:
1. Rear side has 2-way'SELECT' switch for selecting 2-Wire or 4-Wire mode in RS422/RS485 application.
2. (Optional) Rear side has 3-way'SELECT' switch for selecting AUTO Mode (No Handshake Signal), DSR+ Mode (+12V Control) and DSR-Model (-_12V Control) for controlling data flow, Max. Distance :1. 2kms. @ 19. 200 bps
Output Cable : Shielded twisted pair cable-90 ohms/km Transient Protection: 2500 V Peak
Front Panel Indications :Power, Rx, Tx and DSR (for control) Power Supply :Mains Input-230V, 50Hz Power :Max. 20 VA Built-In Power Supply
Size:117mmx 105mm x 55mm
INSTALLATION INSTRUCTIONS:
Switch Settings:
1. 2-WAy SELECT SWITCH : Select 2-wire (halt duplex) or 4- wire(full duplex) mode on 2-way switch on the back panel.
2. 3-WAY CONTRoL SWITCH (Optional) :
A. Position1- Auto - No Handshake Control
B. Position 2-DSR + ( +12y) to enables RS485 output
C. Position 2-DSR - ( -12y) to enables RS485 output
Long distance cable between two RS422/RS485 interfaces must be a twisted pair shielded cable.The pair should be used for each signal type + and - signal.This gives high common mode noise rejection.While laying the cable,care should be taken not,to lay this cable parallel to power lines cables.The cable resistance should not be more than 90 ohms/100 meters.The cable should be run through conduit pipe for physical protection.
Terminating Resistor:
Terminating Resistor of value 180 ohms is required for 2 wire RS-485 configuration at each end between + and - output of the RS-485 port.In multi drop configuration ,terminating resistor should be connected on LD-15U RS-485 port as wel as on the last
Milestone model LD-15U is a RS232, to RS422/RS485 converter is designed for high-speed data transmission between computer system
and or peripherals over Iong distance under high noise conditions.
They provide dual line interface per signal.
APPLICATIONS:
Application for these converters can be for factory automation,
Programmable logic controllers,, attendance recording systems,
Barcode Readers, remote data transmission, remote terminals, EPABX etc.
SPECIFICATIONS:
Input: RS232-T×D, R×D, DSR (for control), GND (D9 Female connector)
Output: RS422/RS485-Tx+, Tx-, Rx+. Rx-(D9 Male Connector). Each signal is protected by spike
suppressor, fuse and has opto-isolation.
Selection Switch:
1. Rear side has 2-way'SELECT' switch for selecting 2-Wire or 4-Wire mode in RS422/RS485 application.
2. (Optional) Rear side has 3-way'SELECT' switch for selecting AUTO Mode (No Handshake Signal), DSR+ Mode (+12V Control) and DSR-Model (-_12V Control) for controlling data flow, Max. Distance :1. 2kms. @ 19. 200 bps
Output Cable : Shielded twisted pair cable-90 ohms/km Transient Protection: 2500 V Peak
Front Panel Indications :Power, Rx, Tx and DSR (for control) Power Supply :Mains Input-230V, 50Hz Power :Max. 20 VA Built-In Power Supply
Size:117mmx 105mm x 55mm
INSTALLATION INSTRUCTIONS:
Switch Settings:
1. 2-WAy SELECT SWITCH : Select 2-wire (halt duplex) or 4- wire(full duplex) mode on 2-way switch on the back panel.
2. 3-WAY CONTRoL SWITCH (Optional) :
A. Position1- Auto - No Handshake Control
B. Position 2-DSR + ( +12y) to enables RS485 output
C. Position 2-DSR - ( -12y) to enables RS485 output
The above connections are for Standard PC Com port.Please verify these connections for any other system or terminal before making the cable.
Long Distance Cable Laying:Long distance cable between two RS422/RS485 interfaces must be a twisted pair shielded cable.The pair should be used for each signal type + and - signal.This gives high common mode noise rejection.While laying the cable,care should be taken not,to lay this cable parallel to power lines cables.The cable resistance should not be more than 90 ohms/100 meters.The cable should be run through conduit pipe for physical protection.
Terminating Resistor:
Terminating Resistor of value 180 ohms is required for 2 wire RS-485 configuration at each end between + and - output of the RS-485 port.In multi drop configuration ,terminating resistor should be connected on LD-15U RS-485 port as wel as on the last
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