When looking at automated material handling systems (AMHS), it is important to know that SEMI E84 is a carrier handoff communication specification. It does not specify distance measurement tolerances. When using Hokuyo’s DMS, DMG, or DMJ products in your SEMI E84 applications, you are transmitting data optically and enabling communication.
The DMS Series for SEMI E84 is designed to transmit interface data optically. Hokuyo describes these products as supporting an 8-bit optical handshake with a 25-pin D-sub connector. Check your application requirements and the exact model configuration to determine which DMS product will work for your needs.
Your transport has arrived at the destination process tool. Several things must work together to ensure that your process tool and transport hand off correctly. Not only do you need to reach that destination, but both devices need to communicate with one another through the handoff interface.
Review the specifications of the product you have installed and check whether your setup meets its communication distance and alignment requirements. Communication distance describes how far apart the optical heads can operate. It is not a distance measurement output.
Any of these issues can cause your handoff to fail. Simply replacing a distance sensor may not solve all of your communication problems, and installing a SEMI E84 compatible product does not ensure that the complete AMHS works correctly.
Just because your connectors fit does not mean that they are configured the same way. Double-check your model number, suffix, pinout, and electrical specifications to make sure they are compatible with your equipment.
Other factors, such as carrier positioning and clean environment requirements, should also be checked when designing your system. However, these are not distance measurement tolerances specified by SEMI E84.
Make sure that your optical heads can see each other at all positions where your equipment can dock. Bracket movement, improper installation, or an obstruction may affect the communication path.
Your SEMI E84 optical interface must operate within the selected device’s specifications. Make sure that communication distance, alignment, and other installation factors are taken into account.
SEMI E84 is designed to provide enhanced parallel I/O interface specifications between active equipment, such as transport systems, and passive equipment, such as process tools and stockers.
资料来源：企业官网公司介绍页面（复核日期：2026-10-29）。