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RS232 to RS485 converter RTS controlled with DB25 connector extended temperature range.
We designed the 485-25A converter to provide error free half-duplex data communication utilizing the standard RS485 protocol. The RS485 driver is enabled through RS232 RTS line providing fast multi-drop capability for a variety of applications using the single pair RS485 differential signals.
Distances in excess of 4000 feet are easily attained with the 485-25A data converter.
These interface drivers conveniently plug into the DB25 connector commonly found on the standard IBM-PC.
The 485-25A can operate for both DTE and DCE configurations with the possible addition of a NULL modem converter for certain DCE applications.
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| Specifications - 485-25AL |
| Temperature Range |
-40°C to +85° C |
| RS-232 connection |
DB25 female |
| RS-485 connection |
5 position .200" spaced terminal block
one twisted pair wiring A/B signals |
| Distance |
4000 feet |
| Speed |
600 BPS to 115200 BPS |
PC Comport
Flow Control Settings |
RTS controlled (rts/cts, dtr/dsr loopback provided) |
| Signal Settings |
RTS(on) = transmit
RTS(off)= receive |
| Transmit Turn Around |
less than 2uS (transmit to receive turn-around) |
| Protection |
Reverse polarity diode protection |
| Nodes |
255 nodes on a single twisted pair
Linear Technologies LTC1487 |
| EMI |
Low EMI RS-485 driver
Linear Technologies LTC1487 |
| Termination |
On board jumper pin control provided |
| Status LEDs |
Yellow power indicator
Bi colored red transmit 232 to 485
Bi colored green receive from 485 to 232 |
| Power requirements |
7.5VDC to 24VDC
40 ma nominal (250 ma dead short) |
| Power Supply |
External power supply required. See our PS9CST |
| Electronic Documentation |
Users Manual
Schematic
Dimensions
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