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# What are RS232 voltage levels?

## What are RS232 voltage levels?

Valid RS-232 signals are either in the range of +3 V to +15 V or the range −3 V to −15 V with respect to the common ground (Figure 1-1). To be more specific, the driver output is Logic 0 when the voltage is between +5 V and +15 V and is Logic 1 when the voltage is between -5 V to -15 V.

## What is the maximum data rate in kbps for the RS423 protocol?

The maximum allowed cable length with RS423 is 1200 meter, just as with RS422 and RS485. The maximum data rate is 100 kbps which is only five times faster than default RS232 and much slower than possible with RS422 and RS485.

What are RS422 voltage levels?

RS-422
Maximum distance 1,200 metres (3,900 ft)
Mode of operation Differential
Maximum binary rate 100 kbit/s – 10 Mbit/s
Voltage levels −6 to +6 V (maximum differential voltage)

### What is the difference between RS422 and RS485?

RS-422 can work and receive with full-duplex operation through two pairs of twisted pairs. RS485 can only work half-duplex and cannot perform transmission and reception simultaneously, but it only needs one couple of twisted pairs. RS422 and RS485 can transmit 1200 meters at 19kpbs.

### How are RS-232 levels different than TTL?

The minimum and maximum voltages of a true RS232 signals are +/- 12/13V., while TTL signals are 0 to 3,3V/5V. The differences between a TTL RS232 (also called RS232-C) and a True RS232 interface is only related to the signal level to GND (Ground) and not with the current to power the scanner.

What is voltage level for logic 1 in RS-232?

-3 to -25V
By the RS-232 standard a logic high (‘1’) is represented by a negative voltage – anywhere from -3 to -25V – while a logic low (‘0’) transmits a positive voltage that can be anywhere from +3 to +25V.

#### What is the voltage level of RS485?

Standard RS485 transceivers operate over a limited common mode voltage range that extends from –7V to 12V. In a commercial or industrial environment, ground faults, noise, and other electrical interference can induce common mode voltages that exceed these limits.

#### What is a RS 485 cable?

RS-485 is an industrial specification that defines the electrical interface and physical layer for point-to-point communication of electrical devices. The RS-485 standard allows for long cabling distances in electrically noisy environments and can support multiple devices on the same bus.

What does Rs-422 stand for?

RS-422. Recommended Standard 422 (ANSI/EIA standard for transmitting serial data)

## How far can you run RS-422?

RS422 is able to provide data rates of up to 10 Mbps at distances up to 50 feet (15.24 metres). However using reduced data rates, RS422 is able to transmit data over distances of 4000 feet (~1220 metres): the maximum is 100 kbps at this distance.

## What does RS422 stand for?

Is RS422 full duplex?

RS-422 uses a twisted pair differential signal (more on this below) for receiving and transmitting data. It runs in full-duplex mode, with each transmission direction using two wires apiece.

### What is the RS423 standard?

The RS423 standard is one of the lesser known serial communication standards. Its older brother RS232 is widely known because serial ports with this interface are present on almost all computer systems.

### What data rates can be accommodated with RS422?

Data rates of up to 100K bits / second and distances up to 4000 Ft. can be accommodated with RS422. RS422 is also specified for multi-drop (party-line) applications where only one driver is connected to, and transmits on, a “bus” of up to 10 receivers.

Can RS422 devices be used for multi-point networks?

RS422 is also specified for multi-drop (party-line) applications where only one driver is connected to, and transmits on, a “bus” of up to 10 receivers. While a multi-drop “type” application has many desirable advantages, RS422 devices cannot be used to construct a truly multi-point network.

#### What is an RS232 to RS422 converter?

In its simplest form, a pair of converters from RS232 to RS422 (and back again) can be used to form an “RS232 extension cord.” Data rates of up to 100K bits / second and distances up to 4000 Ft. can be accommodated with RS422.