SGX-120L Hardware Reference

DISCONTINUED: REFERENCE ONLY

This page describes the SGX-120L's hardware, hookup, configuration and specifications. For information on the display's fonts and instructions, information please see the programmer's reference. These instructions apply to SGX-120L, version 2.0. For a summary of differences from the earlier versions, see the upgrade guide.

Table of Contents

Hardware

Cautions/Warranty

Connect/Configure

Dimensions

Mounting

Specifications

Other Pages

Index, Revision History

Programmer's Reference

v2.0 Upgrade Guide

Product Description

Configuration

Windows Configuration Utility

Cautions and Warranty

Handling, Usage and Operating Precautions

• Do not exceed the maximum supply voltage of 5.3Vdc.
• Always ensure that supply polarity is correct.
• If the screen requires cleaning, use low-tack tape to remove dust.
• Do not wipe or scrub the screen; it is easily scratched.
• In a permanent installation, mount the display behind a transparent window.
• Protect the unit from electrostatic discharge (ESD).
• Do not subject the display to sharp impact or mechanical pressure.
• Do not disassemble, drill or modify the unit in any way.
• Do not allow solvents, cleaners, or water to come into contact with the screen.
• Do not operate when wet or under conditions of condensing humidity (dew).

Seetron warrants this product against defects in materials and workmanship for a period of 90 days. If you discover a defect, we will, at our option, repair, replace, or refund the purchase price. Return the product with a description of the problem. We will return your product or its replacement via standard shipping. Expedited shipping is available at the customer's expense. Note: Violating the usage guidelines above, or attempting to repair or modify the module or the serial interface, voids this warranty.

Connection/Configuration

Hooking up the SGX-120L requires three connections: +4.8 to 5Vdc (regulated), serial input (9600 bps, N81) and ground (connected to both power and the computer/controller).

SGX-120L Serial Interface Board.

Configuration Jumpers

There are two configuration jumpers on the SGX-120L serial interface:

• Dsu (Display Setup): Uncut= Demo/Setup Mode; Cut= Run Mode—Settings write-protected
• In Demo/Setup mode, the display runs a slideshow of all stored graphics, and will accept changes to startup settings via the ESC-W command.
• In Run mode, there's no slideshow, and the startup settings are write-protected. Stored bitmaps are not write-protected unless this setting was made via ESC-W (before cutting the jumper).
• Spol (Serial Polarity): Uncut=Inverted TTL or RS-232 serial; Cut= Non-inverted TTL (UART-direct) serial
• Leave Spol uncut if SGX is to be used with an RS-232 port (PC com port, or USB adapter with a 9-pin D connector), or in a microcontroller application that outputs inverted serial. That would include applications that previously worked with other Seetron serial LCDs, such as BPI, BPK, BPP, ILM, and VFD-series devices.
• Spol should be cut if the SGX is to be connected directly to a UART-type device, or microcontroller that acts like one, outputting non-inverted TTL serial. This includes inexpensive USB serial adapters that connect via breadboard pins, and many single-board computers (e.g., Arduino) whose documentation states that their serial output is not RS-232 compatible.

Serial Input Electrical Chacteristics

The SGX-120 is directly compatible with both RS-232 and UART-direct serial hookups. This information is provided for the benefit of users who may be interfacing the display to low-voltage or nonstandard logic devices.

The serial input of the SGX-120, shown below, uses an XNOR gate with Schmitt-trigger characteristics. Under logic control (marked Spol Out), the gate is set as inverting or noninverting as needed to deliver the correct data polarity to the controller's UART input. Spol Out also ensures that the serial input is lightly pulled to the idle state (low for inverted input; high for noninverted) to ensure that the input doesn't float when disconnected.

These features reject noise that might otherwise show up as garbage characters on the screen. They also complicate the question of the serial-input logic threshold, since this will depend on the Spol setting and the edge (rising or falling) of the input signal. In the table, 'Transition' refers to the direction of change on the serial input (output of the device driving the SGX-120). The idle-to-start-bit transitions are highlighted.

Dimensions (in mm)

Total depth (front of screen to highest point on pcb) is 24mm. Back and side-view drawings are TBD.

Mounting

As mentioned in "Cautions" above, SGX-120L must be mounted behind a transparent window in any permanent installation. If it is not, the screen will be vulnerable to damage from users' fingers (e.g., electrostatic discharge or mechanical stress), moisture, dirt, mechanical damage, etc. Damage of this kind is not covered by warranty.

An inexpensive mounting kit is available for these devices (PN: BEZ-120), but any transparent barrier will suffice.

Specifications