RS232485 Communications Adapter

The RS232485 is designed to take RS-232 from a standard PC COM port and convert it to RS-485. It incorporates the adapter into a 9 pin, D-sub backshell. RS-485 provides improved noise immunity over long cable lengths, and allows a network of up to 100 SmartMotors to be operated in a parallel fashion instead of daisy chaining the communications from one motor to the next. This feature reduces the burden of coordination for many multi-axis applications. The converter circuit is entirely housed within the connector backshell. It requires 5VDC, typically supplied by the first SmartMotor in the chain. The RS-485 A and B output signals are single ended and biased for bus mastering. With RS-485, all SmartMotors hear a message at the same instant in time. There is no echoing of data from one motor to the next. While that saves time, it also makes it necessary that each motor have a unique address originating from its own program. It is also imperative that the SmartMotor program not have an ECHO command. They must remain in their non-ECHO default state to protect the data bus. Use the SADDR command to set address, and the OCHN command to open the communications port as RS-485.

Features
* Noise immunity.
* Extended range.
* Firmware supported.
* Convenient size and mounting.

Benefits
* Ideal for noisy industrial environments involving such things as TIG welding or plasma heads.
* Cable runs of 1,000 feet possible for remote applications (305m).
* Mounts neatly inside the cable connector backshell.
* Firmware includes built in OCHN mode.

Electrical:
Bus DC line Voltage: 5VDC
Driver Output Voltage Unloaded 2VDC min, -2VDC min
Driver Output Voltage Loaded 2VDC, -2VDC
Receiver Voltage Range +12VDC to -7VDC

Mechanical:
Dimensions: see figure
Weight: 0.5 oz (14.2g)

Environmental:
Operating Temperature: 0 to 50? C
Storage Temperature: -20 to 70? C
Humidity: 0 to 90% non condensin