ALR111-S51 | Yokogawa | RS-232 Communication Module

Product Description

The Yokogawa ALR111-S51, also cataloged as the ALR111-S51 RS-232 Communication Module, provides serial data communication between Yokogawa control hardware and external RS-232 devices. It handles TXD, RXD, RTS, CTS, and GND signals through a DB9 male connector.

Suffix Breakdown & Model Matrix

The supplied data identifies ALR111-S51 as a complete model designation. No documented suffix matrix or ordering-code breakdown was provided, so no additional suffix interpretation is assigned.

Hardware Specifications

DCS Serial Communication Characteristics

The ALR111-S51 uses the RS-232 electrical interface for serial data exchange. The module supports transmission rates up to 115200 bps, allowing the connected equipment to select a compatible communication rate.

The interface provides TXD and RXD for serial data transmission and reception. It also provides RTS and CTS for hardware flow control, while GND establishes the signal reference. Therefore, the external device must match the required signal assignment and RS-232 electrical interface.

The module provides LED indications for power, transmit, receive, and error status. These indicators allow technicians to observe basic communication activity directly at the installed hardware.

Frequently Asked Questions

Q: What serial interface does the ALR111-S51 use?
A: The module uses an RS-232 serial interface with TXD, RXD, RTS, CTS, and GND signals.

Q: What is the maximum specified baud rate?
A: The supplied specification lists a maximum communication speed of 115200 bps.

Q: Which physical connector does the module use?
A: The supplied data specifies a DB9 male connector for the RS-232 interface.

Field Installation Guidelines

Install the ALR111-S51 using the specified DIN rail or panel mounting arrangement. Confirm that the mounting hardware holds the module securely before connecting field wiring.

Verify the RS-232 signal assignment before commissioning. Match TXD, RXD, RTS, CTS, and GND between the module and the connected equipment according to the applicable wiring documentation.

Route serial communication cables separately from high-voltage power wiring and strong electromagnetic interference sources. Use suitable shielded communication cable where the installation requires additional noise control.

Before operation, verify the communication parameters at both ends of the serial link. Check the baud rate and other configured serial parameters against the connected device documentation.

Use the Power, TX, RX, and Error LEDs during commissioning to check basic module status and serial communication activity.

Other Attributes

• Country of Origin: Japan/Singapore
• Lead Time: In Stock, 2 Working Days

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