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

Cautions and Warranty

Handling, Usage and Operating Precautions

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 hookup

SGX-120L Serial Interface Board.

Configuration Jumpers

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

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.

Serial input structure

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.

Serial Input Thresholds (Vdd=5V)
Spol Input Type Transition Vthreshold
Uncut Inverted Low-High↑ 3.0V
High-Low↓ 2.0V
Cut Noninverted Low-High↑ 2.6V
High-Low↓ 1.6V

Dimensions (in mm)

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

dimensions
A y offset edge to hole center (top & bottom) 4.00
B y pcb height 36.00
C y hole spacing 28.00
D y screen opening 18.50
E1 y character height (small font) 3.92
E2 y character height (large font) 7.84
F1 x character width (small font) 2.94
F2 x character width (large font) 5.88
G1 x offset pcb edge to hole center (bottom) 2.50
G2 x offset pcb edge to hole center (top) 4.00
H x screen frame 68.20
I x screen opening 60.50
J1 x hole spacing (bottom) 75.00
J2 x hole spacing (top) 72.00
K x pcb width 80.00
L y frame height 28.30
- mounting hole diameter 2.50
- screen frame depth 9.00

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

Power Requirements 4.8 to 5.5Vdc at 8-10mA (65mA backlight on)
Serial Input (electrical) RS-232 (±15V OK), UART, TTL
Serial Input (logic/data) Inverted or noninverted, 9600bps
User Connector 5-pin header, 0.025in. posts on 0.10in. centers
Connector Pinout +5V Gnd Serial Gnd +5V
Operating Temp. 0° to 50° C (32° to 122°F)
Display Type STN Graphics LCD, 120x32 pixels
Font Sizes 5x7 pixels, 3.92 to 5.88mm (0.15 to 0.23 in.) height
Overall Size (wxhxd) 98x60x24mm (3.86x2.36x0.94in.)
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