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RS485 to RS232 addressable converter with DB25 connector and terminal strip for RS485 connections.
The 485-ADR converter provides an easy way to build a network of devices out of existing RS232 equipment. These units provide both Transmit and receive buffering of RS232 data and a full 16 bit CRC checksum for the RS485 network packet error detection. RS232 and RS485 baud rates are individually selected and can support differing baud rates.
The packet protocol used on the RS485 communication side is modeled after the ModBus protocol, and can detect duplicate packets in a case where the acknowledge packet from the Send RS232 Data becomes corrupted.
Parameters are configured through a dedicated Debug/Configuration port. All programmed parameters are stored on non-volatile memory. The unit parameters are set using a dumb terminal program, such as EZ-Terminal. When this unit is not in configuration mode, this dedicated port is used to dump debug information. This information includes, RS485 Packet Received, RS485 Packet Sent, RS232 data sent, parity error, etc.
The 485-ADRPM unit is required to set parameters to the 485-ADR.
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| Specifications - 485-ADR |
| Microprocessor |
Rabbit 2000 |
| Baud Rate |
The 485-ADR allows Independant RS-232 and RS-485 baud rates
RS232: 110-115200 BPS
RS485: 110-115200 BPS |
| Temrature Range |
0° - 70°C
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| Signal Settings |
Configured via monitor port. Use the 485-ADRPM to configure the 485-ADR (included). No jumpers, soldering, or resistor/capacitor replacement. |
| LED |
1 Bicolor RS-232 Signal LED.
1 Bicolor RS-485 Signal LED.
1 Bicolor Unit Operation Status LED. |
| PC Comport Flow Control Settings |
The RS232 port supports the most popular formats. Those formats includ 7 or 8 bit byte frames, 1 or 2 stop bits. "Even, Odd, or No" parity, and RTC/CTS hardware flow control. |
| RS232 Connection |
DB25 female
DB9 female (each package includes a DB25-DB9 adapter) |
| RS485 Connection |
.200" spaced terminal block.
One twisted pair wiring A/B signals. |
| Speed |
120.0K BPS Max. |
| Distance |
RS232: 50 feet
RS485: 4000 feet+
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| EMI |
Low EMI RS-485 driver
Linear Technologies LTC1487. |
| Nodes |
255 nodes on a single twisted pair
Linear Technologies LTC1487. |
| Termination |
Jumpers to enable and disable active/passive termination. |
| Power Requirements |
7.5VDC - 24VDC, usage 200 ma. nominal (250 ma. dead short)
Note: If your power source exceeds the rated voltage of our converter we now offer the option of extending that voltage range (up to 60 VDC) with the PWR-ADPT add-on adapter. |
| Power Supply |
External power supply required.
Power can be connected to terminal block, or convenient power jack.
Our PS9J
or PS9CST power supply may be used.
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| Electronic Documentation |
Users Manual
Schematic
Dimensions
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