Overview
Communication Functions
The 1769-ASCII provides two serial communication ports for exchanging ASCII data. Each port can be configured independently, allowing different communication settings for connected devices.
Furthermore, the module supports hardware RTS/CTS handshaking. This function coordinates serial data transmission between communicating devices and helps manage data flow when the connected equipment requires hardware handshaking.
Serial Interfaces and Data Handling
The module supports full-duplex RS-232 and RS-422 communication, as well as half-duplex RS-485 communication. These interface options allow it to connect with different types of serial equipment, subject to the electrical and wiring requirements of each interface.
In addition, the module provides serial port status information, including TX FIFO overflow, RX FIFO overflow, RX parity error, handshake error and new data flags. These indicators help maintenance personnel identify communication errors and monitor data exchange.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-ASCII |
| Brand | Allen-Bradley |
| Product Type | ASCII Communication Module |
| Product Line | CompactLogix |
| Module Type | Communication Interface Module |
| Series | A and B |
| UPC | 612598314232 |
| Communication Protocol | ASCII |
| Number of Channels | 2 |
| Serial Interfaces | RS-232, RS-422, RS-485 |
| Communication Mode | Full duplex (RS-232, RS-422); Half duplex (RS-485) |
| Port Configuration | Independently configurable |
| Handshaking | RTS/CTS hardware handshaking |
| Bus Current | 425 mA at 5 VDC |
| Current Draw at 24 VDC | 0 mA |
| Maximum Power Dissipation | 2.13 W |
| Maximum Thermal Dissipation | 7.3 BTU/hr |
| Power Supply Distance Rating | 4 |
| Isolation Voltage | 30 V continuous |
| Isolation Test Voltage | 710 VDC for 60 seconds |
| Input Words | 108 |
| Output Words | 108 |
| Configuration Words | 31 |
| Serial Input Voltage Signal | 3 to 25 VDC (logic 0); -3 to -25 VDC (logic 1) |
| Serial Port Status | TX FIFO overflow, RX FIFO overflow, RX parity error, handshake error, new data flag |
| Recommended Cable | Belden 8761, shielded |
| Mounting | DIN rail or panel |
| Operating Temperature | 0 deg C to 60 deg C |
| Weight | 1.31 lbs (0.60 kg) |
Controller Compatibility and Installation
The 1769-ASCII is specified for use with CompactLogix and MicroLogix 1500 controller systems. It receives operating power through the system backplane rather than requiring a separate field power supply.
The module has a power supply distance rating of 4, which defines its permitted position relative to the system power supply. Furthermore, its two serial communication channels allow separate connections to compatible ASCII equipment.
For serial wiring, Belden 8761 shielded cable is the recommended cable type. Select the RS-232, RS-422 or RS-485 wiring arrangement according to the connected device and the required communication mode.
Frequently Asked Questions
Q: How many serial ports does the 1769-ASCII provide?
A: It provides two independently configurable serial communication channels. Each channel supports ASCII data exchange through the available serial interface options.
Q: Which serial communication standards does this module support?
A: The module supports RS-232 and RS-422 in full-duplex mode, and RS-485 in half-duplex mode. Select the appropriate interface and wiring configuration for the connected equipment.
Q: What power supply does the 1769-ASCII require?
A: The module draws 425 mA from the 5 VDC system backplane and 0 mA at 24 VDC. Its maximum power dissipation is 2.13 W.
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