2-Channel Serial Communications Module | 1769-ASCII Allen-Bradley
Manufacturer: Allen Bradley
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Part Number: 1769-ASCII
Condition：New with Original Package
Product Type: Communication Interface Modules
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Allen-Bradley 1769-ASCII CompactLogix ASCII Interface Module
The Allen-Bradley 1769-ASCII, also cataloged as the 1769-ASCII Communication Interface Module, operates as a dedicated hardware component for serial data string translation and ASCII device character buffering within CompactLogix network platforms. Configured to interface directly with alphanumeric peripherals such as barcode scanners, weigh scales, and serial printers, the hardware processes character strings into digital word structures over physical communication lines without using external gateways.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-ASCII |
| Brand | Allen-Bradley |
| Origin | United States |
| Weight | 0.13 lbs (0.06 kg) |
| Dimensions | Standard CompactLogix 1769 single-slot module width |
| Operating Temp | 0 deg C to 62 deg C (32 deg F to 143.6 deg F) |
| Power Rating | 425 mA at 5 VDC |
| Backplane Current | 1.4 Amps at 24 VDC |
| Channels | 2 independent serial channels |
| Physical Interfaces | RS-232, RS-422, RS-485 |
| Serial Modes | 2 Full-Duplex RS-232, 2 Half-Duplex RS-422 / RS-485 |
| Flow Control | RTS/CTS Hardware Handshaking enabled |
| Input Word Allocation | 108 words |
| Isolation Voltage | 30 Volts continuous |
| Maximum Power Dissipation | 2.13 Watts |
| Thermal Dissipation | 7.3 BTU/hr |
| Power Supply Distance | Maximum 4 modules |
Local Bus Configuration and Firmware Flash Compatibility
The specialty interface maps an array of 108 input words into the controller register memory during active scan cycles. Maintaining local backplane bus communication velocity requires strict compliance with the power supply distance rating, which specifies that the hardware component must sit within 4 slots of the system power source. Integrating this communication module into an EtherNet/IP deterministic network architecture requires verification of firmware flash compatibility to properly handle character-received interrupts and string buffer parsing without disrupting local I/O density scaling routines.
Frequently Asked Questions
Q: Can the serial ports on the 1769-ASCII module be configured for concurrent mixed protocols?
A: Yes. The 2 built-in serial channels operate independently. One interface channel can handle Full-Duplex RS-232 data strings to a printer while the second interface operates in Half-Duplex RS-422 or RS-485 mode to capture peripheral sensor strings.
Q: Does the module support Removal and Insertion Under Power (RIUP) within a running system?
A: No. The 1769 platform does not support hot-swapping. Attempting to pull or plug the communication module while the chassis backplane carries an electrical load will cause internal bus transceiver damage and generate an unrecoverable processor major fault.
Field Installation Guidelines
- Backplane Interlocking and Structural Alignment: Slide the module alongside the adjacent 1769 component using the physical tongue-and-groove side tracks. Firmly actuate the upper and lower locking bus levers forward to bridge the data bus tracks before turning on system power.
- DIN-Rail Assembly and Grounding Integrity: Fasten the open-type hardware onto an EN 50022 compliant 35 mm DIN rail or utilize the pull-out expansion tabs to bolt the module to the panel enclosure plate. Verify the structural chassis frame contacts a low-resistance earth plane to minimize serial data line jitter.
- Serial Cable Shielding and Route Layout: Terminate serial links using twisted-pair cables featuring separate copper shields. Route all RS-232, RS-422, and RS-485 paths strictly away from high-voltage motor conductors, power switchgear, and variable frequency drives to prevent character drop errors.