CED Products | CED 4704 Potentiometer

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CED 4704 Potentiometer Specification

The CED 4704 USB slider potentiometer is straightforward to use. When the USB cable attached to the 4704 is plugged into an active USB port on a host computer, the computer sees a virtual serial port. Commands are given down the port, and responses returned from the 4704. This communication method will work with most application programs that support ASCII text transfer. The 4704 LED turns red if unknown commands are sent.

The LED flashes green for 200ms in response to an FL command and longer flashes by sending FL;FL;… on a line. This can be used as user signalling, or to show that communication with the host computer is established.

Linear movement:	95mm nominal
Sliding resistance:	20g approx.
Data resolution:	1 part in 1000
Data return:	Single value, or continuous values at a specified rate until commanded to stop
Return data format:	ASCII: 0.0 to 100.0 or 0 to 100 (first two leading zeroes suppressed) + CR
Command format:	Two letter command terminated by a semicolon or CR
Interrogation format:	Question mark (?) immediately preceding a command
Command error report:	Non-zero value response to error interrogation command (?ER)
Return rate (default):	10 values/sec
Return rate range:	100/sec to approx. 2/min, settable by command
Indicator LED	Flash on for 200ms by command. Up to 8 FL; commands can be sent in one line
ID string	“USB slider pot xx”, where xx are the last two digits of the unit's serial number
Interface:	Standard USB A connector on 1800mm attached cable
Serial data format:	ASCII, 9600 baud, no parity, 1 stop bit

Power required: 5 V d.c. 50mA (supplied from USB port)

Case size: 160mm (width) x 70mm (depth) x 30mm (height), excluding control knob

Weight: 300g

Calibration

The 4704 returned values are slider position ratios, independent of USB supply voltage. The zero-end travel offset (TO) is calibrated before despatch. The full-scale end-resistance on the main slider can be corrected for ageing by adjusting a single-turn trimmer accessible through a small hole in the slider case adjacent to the LED. With the slider knob fully to the right (max), adjust the trimmer so that the 4704 returns the value 100.0

CED 4704 safety, cleaning and environmental information

Use only USB power for powering the CED 4704
There is no power switch on the CED 4704. To remove power from the unit, disconnect the USB cable
Operate the CED 4704 in conditions of non-condensing humidity at an ambient temperature below 50 ºC
The CED 4704 case is not resistant to the ingress of water or other fluids
There are no user serviceable parts inside the CED 4704 case
The CED 4704 is suitable for continuous use
Clean only with a dry cloth when required
DO NOT immerse in water or any other chemical solution
The case and components within the CED 4704 are recyclable. Please consult CED for details.