# Digi One IAP - Honeywell EPKS EIM - explicit messaging or implicit messaging

**URL:** <https://forums.digi.com/t/digi-one-iap-honeywell-epks-eim-explicit-messaging-or-implicit-messaging/21708>\
**Category:** Digi One IA/IAP\
**Tags:** ethernet, ip, communication, one, 1\
**Created:** [August 26, 2020, 10:12am UTC](https://forums.digi.com/t/digi-one-iap-honeywell-epks-eim-explicit-messaging-or-implicit-messaging/21708 "2020-08-26T10:12:36Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![kjin](https://avatars.discourse-cdn.com/v4/letter/k/e8c25b/32.png) [@kjin](https://forums.digi.com/u/kjin)\
**Post date:** [August 26, 2020, 10:12am UTC](https://forums.digi.com/t/digi-one-iap-honeywell-epks-eim-explicit-messaging-or-implicit-messaging/21708/1 "2020-08-26T10:12:36Z")

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i have couple of digione IAP will convert the Ethernet/IP client/server request from ethernet side to modbus RTU equipment on serial side.

the client on ethernet side is Honeywell EPKS Ethernet interface module which talk ethernet/ip, CIP by class 1 (implicit messaging) or class 3 (explicit messaging).

i could not find much information about the type of the ethernet/IP digi One IAP is using. found one example showing it used slc type read/right, is that meaning Digi One will only talk Class 3 explicit methods?

Thanks