This bi-directional RS232 to RS485 converter is a port-powered simple and reliable solution for most standard commercial and industrial communications needs. It converts RS232 signals to half-duplex RS485 balanced differential signals and extend the communication distance to 4000 FT (1.2 km). It uses an internal amplifier to gain power from the RS232 signals (RTS, DTR, TXD) without initializing the RS232 interface. In case the RS232 port is not capable of supplying sufficient power, an external power supply can easily be connected to the converter. Automatic Send Data Control is enabled which means no software drivers are needed. This converter utilizes the popular MAX491 chip from Maxim/Dallas Semiconductor. Easy to incorporate with any Point-to-point and point-to-multipoint networks.

Overall features
- Port-powered, no external power supply required
- Plug and play, no drivers needed
- Static and surge protected
- Optional external power supply
- Automatic Send Data Control.
- Working mode: asynchronous, half-duplex.
- CE, FCC, RoHS ISO 9001 Certified
- Terminal board included with each unit.

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SPECIFICATIONS
Model number RS485D9
Baud rate 300 - 115200bps
Power Port-powered from RS232 (RTS, DTR, TXD)
Optional external power: 5 - 12VDC
Current consumption < 10mA
Interface RS232 DB9 female connector
Interface RS485 DB9 male connector and terminal board
Working mode 2-wire RS485 asynchronous, half-duplex
Standards EIA/TIA RS-232C / RS485
Transmission distance RS232 Typical: 15 FT (5m)
Transmission distance RS485 Typical: 4000 FT. (1200m)
Static protection 1500W
Surge protection 600W/ms
Operating Temp. -40°F to 180°F (-40°C to 85°C)
Operating humidity 5% To 95% - No Condensation
Dimensions 2.47” x 1.33” x 0.70” (62.8 mm x 33.8 mm x 17.8 mm)
Warranty 5-year Limited Warranty

RS232 RS485
DB9
RS232
1
DCD
2
RXD
3
TXD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
Pin
DB9 male
Terminal board
1
D-/B
D+/A
2
D+/A
D-/B
3
-
GND
4
-
+5V ~ +12V
5
GND
-
6
5 ~ 12V
-
7
-
-
8
-
-
9
-
-
rs232 to rs485 adapter
Click images to enlarge
rs232 to rs485

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