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Converter is compatible with the RS - 232, RS - 485 standard, can be an RS - 232 signal is converted to Differential signaling of the RS - 485 / RS422, without external power supply, internal adopt unique "RS - 232 charge pump" drive the whole circuit; Circuit with zero delay automatic transceiver conversion device, prevent collision of the I/O circuit automatic control data flow direction, so as to ensure the programs written in the RS - 232 manner without change, can be in the safe operation of the RS - 485 / RS422 mode, and fully ensure that suitable for the operation of the existing software and hardware interface.
Product Origin:
chinaBrand:
DTECHItem NO.:
dt-9003Shipping Port:
guangzhou/shenzhen
The product shape using the DB-9 universal adapter plug, an output interface with a common terminal, can use a twisted pair or shielded wire, connection, convenient disassembly. When the converter operates in RS-485 half duplex mode, mode of connection using direct way, respectively is T/R+ connected to the other A+, T/R- connected to the other side of the B-. When operating in the RS-422 full duplex mode, using the cross connection mode, respectively is T/R+ connected to the other RXD+, T/R- connected to the RXD-, RXD+ connected to the other TXD+, RXD- connected to the other TXD-.
DT-9003 interface converter supports the following four kinds of communication mode:
1、Four line, point-to-point full duplex
2、Point to multi point / line four full duplex
3、Point to point / line two half duplex
4、Point to multi point / line two half duplex
Note: in order to prevent the reflection and interference signal, need to be connected with a matching resistor in the circuit terminal (parameter 120 ohm 1/4W), as the case may be.
1, Interface characteristics: interface compatible with EIA/TIA RS-232C, RS-485/RS-422 standard
2, Electrical interface: RS-232 end DB9 connector, RS-485/422 end DB9 needle type connector, with terminal
3, Work mode: Asynchronous Full Duplex, half duplex difference automatic selection of transmission, without jumper settings
4, Transmission medium: twisted pair or shielded wire
5, Transmission rate: 300BPS-115.2KBPS
6, Size: 64mmX33mmX17mm
7, Use of the environment: -20 degrees to 70 degrees, relative humidity of 5% to 95%
8, Transmission distance: 1200 meters (RS-485 end) 5 meters (RS-232 end)
Troubleshooting
1, communication failure
A, check the RS-232 interface connection is correct
B, check the RS-485/RS422 output interface wiring is correct
C, check the wiring terminal is connected well
2, data loss or error
A, check the data communications equipment, data rate, format is consistent with both ends
3, Signal is not stable
A, can be in the 485 end with the last line termination resistors, or replace the active converter
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