EnviroDIY | Ed Verhamme | Activity https://www.envirodiy.org/members/everhamme/activity/ Activity feed for Ed Verhamme. Sun, 07 Jun 2026 02:44:18 -0400 https://buddypress.org/?v= en-US 30 hourly 2 4036d4651399b451c90920a12a782639 Ed Verhamme replied to the topic Mayfly RS232 Compatability (TTL to RS232 adapter?) in the forum Mayfly Data Logger https://envirodiy.org/topic/mayfly-rs232-compatability-ttl-to-rs232-adapter/#post-2326 Thu, 10 Aug 2017 13:15:15 -0400 According to the photos of your CR1000 you were using COM4. The only true RS232 port on the CR1000 is the DB-9 RS232 port.. all of the C1 to C8 I/O are TTL voltages. So you might not need any voltage converters…. Have you tried it without them?

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