Serial to lcd cable

There are special specifications for this. All signals are measured in reference to a common ground, which is called the signal ground AB. A positive voltage between 3 and 15 Vdc represents a logical 0 and a negative voltage between 3 and 15 Vdc represents a logical 1. This switching between positive and negative is called bipolar. The zero state is not defined in RS and is considered a fault condition this happens when a device is turned off. According to the above a maximum distance of 50 ft or 15 m.

This is according to the official specifications, the distance can be exceeded with the use of Line Drivers. The secondary signals are used on some DCE's.

Those secondary channels are mostly of a lower speed than the normal ones and are mainly used for administrative functions.

Cable pinning Here are some cable pinning that might be useful. Not all applications are covered, it is just a help:. To Computer. To Modem. To Computer 1. To Computer 2. ARC Electronics Some applications require more pins than a simple async. Pins used for Synchronous data.

RS Specs. RS 25 pin Tail Circuit Cable. Null Modem cable diagrams Nullmodem 9p to 9p Nullmodem 9p to 25p Nullmodem 25p to 25p. Cross Pinned cables for Async data. Carrier Detect. Receive Data. Transmit Data. Data Terminal Ready. Signal Ground. Data Set Ready. Request to Send. Clear to Send. Ring Indicator. Mode of Operation. Maximum Cable Length. Maximum Data Rate. Maximum Driver Output Voltage. Driver Load Impedance Ohms. If you where using a serial lcd you'd have to wire all 16 pins to the arduino instead of having the prepackaged backpack do all the grunt work for you.

Correct me if I'm wrong, but if you hooked up all the 16 wires direct to the Arduino, that would be a parallel lcd display, not serial. The tutorial shows how to use the backpack converted lcd to hook it up using serial rather than parallel so it really is accurate.

Question 3 years ago. Got compiled no but giving blank backlight display mine using 0x3F address is there any shorting to be done. Reply 4 years ago. Ok I got mine figured out. Here's where I got the answer, and this is a great, packed-with-info video: At one point he mentions that there are three jumpers on the back of the I2C backpack mine are labeled A0, A1, and A2 which are unsoldered. This instructable assumes what is in the video above - that the baseline serial address for the backpack is 0x The backpack does NOT have anything soldered in the jumpers area so basically whoever made the backpack I have is not following the convention at all.

The 0x27 address shows up over and over in tutorials, but is apparently not always the case. I didn't have to do this, but if you don't know the serial address, you can use this link to write code to find it for you.

I was slowly going nuts I never thought about this address, as it's really mentioned in every tutorial I'm having the same problem Best Microcontroller Projects. RS can be setup with 2 signal wires and one ground connection. RS can be operated over long distance. Comments Have your say about what you just read! Leave me a comment in the box below. Recent Articles. Readers Comments. I find here many useful projects and tips. Learn Microcontrollers. Very useful, uncovered, honest and clear.

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Cursor x position is set to 10 and is displayed. Cursor y position is set to 1 and ABC is displayed. I have problems to get the "hello world" example running. Lots of weird characters are displayed, sometimes changing their positions. Sometimes parts of the "Hello World" text show up, too. My major concern is that the cable is simply too long and the signals get distorted.

Is there any relief? Which values might be appropriate for a start? Would I need a shielded cable? I noticed that in the examples, E is connected to a pin that is suitable for PWM, but that should not matter - does it? Partially solved: I forgot to connect the 5V line but still the display LED connected in parallel to the power supply was on.

But it seems, it was Just powered by the other pins. Drove me nuts for 2hrs, now.