Most OEM manufacturers facing SECS/GEM integration for the first time assume that in-house development offers greater control. That assumption rarely holds up once the trade-offs surface, and the choice between an SECS/GEM SDK and custom development determines your timeline, your maintenance costs, and how quickly you reach the fab floor.
What is involved in custom in-house SECS/GEM development
Building SECS/GEM software from scratch starts with the standards themselves. SEMI E4, E5, E30, and E37 define the message structure, state models, and communication behaviour that your equipment must implement correctly before a fab will run acceptance testing on it.
None of that work ends at first compliance, because every update to the standards or a customer’s host requirements lands back on whichever engineers wrote the original code.
In-house development means owning every edge case your equipment encounters, from timeout handling to malformed message recovery to state transitions that only surface under specific host behaviour. Teams that start confident in their estimate often find, months in, that the SECS/GEM protocol runs deeper than the initial scope suggested, and qualification slips as gaps are found one by one.
What an SDK gives OEM teams that custom development does not
A SECS/GEM SDK for OEM handles the communication layer out of the box, so your engineers can spend their time on equipment-specific logic rather than protocol implementation. Message construction, state models, and timeout behaviour are already built and tested against the standard, which removes the part of the project most likely to run over schedule.
Pre-validated SECS/GEM compliance changes what acceptance testing looks like. Equipment tested against the standard using a proven SDK carries far less risk of rejection at the fab, and the subsequent testing cycle shortens because fewer issues surface for the first time on the customer’s floor. Standard updates and new fab requirements are absorbed by the SDK vendor, not your engineering team.
Engineers unfamiliar with the full depth of SEMI E30 can still produce a compliant equipment model without deep protocol expertise.
When custom development makes sense and when it does not
Custom development can be justified when your equipment behaviour is sufficiently specialised that a standard SDK would require significant modification to accommodate it. For most OEM manufacturers, that scenario is the exception rather than the rule, and the maintenance burden of a custom implementation tends to grow rather than shrink as fab requirements evolve, and the engineers who built it move on to other projects.
The real question is rarely whether your team can build a custom SECS/GEM software stack. It is the cost of that stack to build, validate, maintain, and support across the equipment’s lifecycle, measured against the engineering hours that would otherwise go into the product itself.
Choosing the right path for your equipment and your team
OEMs with limited SECS/GEM protocol expertise, a tight delivery timeline, or a growing equipment portfolio are typically better served by a proven SDK than a custom build. The best SDKs pair standards compliance with flexibility, offering integration options across multiple programming languages and development environments rather than locking your team into one approach.
With over 15 years of deployment experience and more than 13,000 installations worldwide, NxSphere® GEM gives OEM teams a low-code development path to SECS/GEM compliance. Explore our SECS/GEM solutions to see where it fits your equipment roadmap, or contact us for a product consultation to talk through which path suits your team.