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- Allen Bradley
- 1769-ASCII
- CompactLogix I/O Module
- USA
- 118 mm × 35 mm × 87 mm
- 0.18kg
- Xiamen, China
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Technical Report: 1769-ASCII Serial Communication Module
1. Product Overview
The 1769-ASCII is a serial communication interface module designed for Compact I/O control systems used in industrial automation. It enables a controller to exchange data with external devices that use ASCII-based serial communication protocols.
Typical connected devices include barcode scanners, printers, weigh scales, RFID readers, and other serial instrumentation that communicates through RS-232, RS-485, or RS-422 interfaces.
This module is not an I/O signal module. It is a communication gateway that converts and manages ASCII string data between PLC systems and serial field devices.
2. Brand and Series Information
Brand: Allen-Bradley
Series: 1769 Compact I/O Series
Product Family: Specialty Communication Modules
Module Type: ASCII Serial Communication Interface Module
3. Product Function Description
The 1769-ASCII module provides two independent serial communication channels for ASCII data exchange.
Core functions include:
- Two serial communication ports
- Support for RS-232, RS-422, RS-485 protocols
- ASCII string transmission and reception
- Buffered message handling for industrial devices
- Hardware handshake control (RTS/CTS)
- Full-duplex and half-duplex communication modes
- Data mapping into PLC memory arrays
It allows PLC systems to directly communicate with serial devices without external protocol converters.
4. Technical Parameters
Communication Specifications
| Parameter | Value |
|---|---|
| Communication Ports | 2 independent channels |
| Protocol Support | ASCII serial communication |
| Electrical Standards | RS-232 / RS-422 / RS-485 |
| Baud Rate Range | 300 to 115,200 bps |
| Data Format | 8-N-1 typical configuration |
| Max Message Length | ~200 characters per message |
| Flow Control | RTS/CTS hardware handshake |
Electrical Specifications
| Parameter | Value |
|---|---|
| Backplane Voltage | 5.1 V DC |
| Backplane Current | ~1.4 A @ 5V DC |
| Power Supply Requirement | 24 V DC (system dependent) |
| Power Consumption | ~33.6 W |
| Power Dissipation | ~7.5 W |
| Isolation Voltage | 30 V continuous |
Mechanical Specifications
| Parameter | Value |
|---|---|
| Dimensions (H × W × D) | 118 mm × 35 mm × 87 mm |
| Mounting Type | DIN rail / chassis mount |
| Slot Requirement | 1 slot |
| Weight | 0.06 kg – 0.18 kg (approx. 0.13 lbs – 0.4 lbs) |
| Enclosure Type | Open industrial module housing |
Environmental Conditions
| Parameter | Value |
|---|---|
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity | 5% – 95% non-condensing |
| Vibration Resistance | Industrial IEC standard |
| Shock Resistance | Up to 15G operation |
5. Product Advantages
1. Direct ASCII Device Integration
Enables direct communication with barcode scanners, printers, and serial instruments without external gateways.
2. Dual Port Flexibility
Two independent serial channels allow simultaneous communication with multiple devices.
3. Multi-Protocol Serial Support
Compatible with RS-232, RS-422, and RS-485, reducing hardware limitations in system design.
4. High Communication Flexibility
Supports configurable baud rates and message structures for different industrial devices.
5. Reduced System Complexity
Eliminates the need for external serial-to-PLC converters in many applications.
6. Real-Time Message Handling
Buffered communication ensures stable data transfer even in high-speed automation environments.
6. Application Areas
The 1769-ASCII module is widely used in:
- Barcode scanning systems in packaging lines
- Industrial printing systems (label and coding printers)
- Weighing and batching systems
- RFID and tracking systems
- Warehouse automation systems
- Conveyor-based identification systems
- Machine data collection systems
- Serial instrumentation integration
It is especially useful in factories where legacy serial devices must be integrated into modern PLC systems.
7. Recommended Models (Same Series / Related Modules)
| Model | Type | Key Parameters | Application |
|---|---|---|---|
| 1769-IF8 | Analog Input Module | 8-channel, high-resolution analog input | Process signal acquisition |
| 1769-OF2 | Analog Output Module | 2-channel voltage/current output | Control output |
| 1769-IQ16 | Digital Input Module | 16-point 24V DC input | Discrete sensing |
| 1769-OB16 | Digital Output Module | 16-point transistor output | Actuator control |
| 1769-AENTR | Ethernet Adapter Module | Dual-port EtherNet/IP communication | Distributed I/O networking |
8. Other Popular Models (Same Brand – Widely Used)
| Model | Type | Key Parameters | Application |
|---|---|---|---|
| 1769-L33ER | PLC Controller | Integrated EtherNet/IP CPU | Machine automation |
| 1769-L36ERM | PLC Controller | High-performance processor, motion control | Advanced automation systems |
| 1769-SDN | DeviceNet Scanner | Master network communication module | Fieldbus integration |
| 1769-ADN | DeviceNet Adapter | Remote I/O DeviceNet adapter | Distributed I/O systems |
| 1769-PA4 | Power Supply Module | AC input system power supply | Rack power distribution |
9. Summary
The 1769-ASCII is a specialized communication module designed for integrating serial ASCII-based devices into industrial PLC systems. Unlike traditional I/O modules, it focuses entirely on data communication rather than signal processing.
Its main strengths are flexible serial communication support, dual-channel architecture, and strong compatibility with industrial devices such as barcode scanners, printers, and legacy instrumentation systems.
It remains a key solution in industrial environments where serial communication is still widely used alongside modern Ethernet-based control systems.