RS232 to RS485 Converter for Security System

Specifications

RS232 to RS485 Converter for Security System

Capabilities parameter

Interface feature: RS-232C RS-485 standard interface compatible with EIA TIA

Electric interface: RS-232 end DB9 hole connector RS-485 end DB9 needle connector with connection pole

Working mode: asynchronism half-duplex difference transmission

Transmission media: twisted -pair or STP

Transmission rate: 300-115.2KBPS

External discharge dimension: 63mmX33mmX17mm

Working circumstance:- 25 to 70 degree C, relative humidity 5%to95%

Transmission distance: 1,200m(RS-485 end) 5m(RS-232 end)

Connector an signal:

RS-232C bay-line distribution

RS-485 data output & connector and bay-line distribution

Hardware installation & application

The product exterior adopts DB-9 to DB-9 all-purpose transitplugs, output plug carries ordinary connection pole, can use TP orSTP and easy connection and disassembly, T/R+ T/R- stands fordispatching A+ B-,VCC stands for standby power input, GNDstands for public ground wire, ,Point-to-point or point-to-multipointhalf-duplex communication need 2 connection (T/R+ T/R-),connection principle is T/R+ connects to opposite T/R+ T/Rconnectsto opposite T/R-,RS-485 half-duplex mode connectionis to connect T/R+ to opposite A+ and T/R-to opposite B-.Remark:A+for(485+),B-for (485-)

HC-01interface supports 2 communication modes as below

1 Point-to-point 2 wires half-duplex

2 point-to-multipoint 2 wires half-duplex

When converter works under half-duplex connection, itneeds to install a matching resistance (data 120 ohm1/4W)for preventing signal reflection and interference.

Communication sketch map

RS-232 to RS-485 conversion

1.RS-485 Point-to-point 2 wires half-duplex