The H485B is a bi-directional port-powered RS232 to RS485 converter. It can convert any standard full duplex RS232C port to any two-wire balanced half duplex RS485 port. In simple terms, it will convert any RS232 signal to a RS485 signal and vice versa. The unit is powered from the RS232 data lines. It also supports data direction auto-turnaround. Therefore, no external power or flow control is required. The data direction auto-turnaround automatically enables the RS485 driver when data is present on the RS232 side making the device plug-and-play, requiring no software drivers.
Features:
1. Port-powered from RS232 port (TXD,RTS,DTR): no external power is necessary
2. Convert RS-232(TXD,RXD signal) to RS-485 signal
3. Plug-and-Play (hot-pluggable, Data format Auto-sensing & Self-adjusting)
4. Data direction auto-turnaround, no flow control is required
5. Point to multi point, support 128 nodes loopback
Specification:
Standards: EIA RS-232C, RS-485 standard
RS-232 signal: TX, RX, GND
RS-485 signal: D+, D-, GND
Working mode: Asynchronism, point to point, 4 wire full-duplex
Transfer rate: 300~115200bps, auto test serial signal rate detect signal speed automatically, zero delay time
Flow control: Data direction auto-turnaround, no flow control is required
Max number of drops: 128 nodes
Transfer distance: RS-485side: 1.2Km
RS-232 side: no less than 5m
Port protect: 1500W surge protection,15KV ESD protection
Connector: RS-232 side DB9 female
RS-485 side DB9M( DB9F to 3 bit terminal block)
Power
Power input: No power supply need, powered from RS-232 port TXD, RTS, DTR
Consumption: Static less than 10mA, dynamic less than 40mA
Environment
Operating temperature: -10°C to 60°C
Storage temperature: -40°C to 85°C
Humidity: 5% to 95%(no condensation)
Appearance
Dimensions: 90.0mm×33.0mm×16.5mm(DB9)
Material: Plastic(shell)
Weight: 40g
