Well, technically guys, and taking that statement at face value (I know it was just meant to point out that alive15 was in error with their thinking on Channel 1 of an SLC 5/04), all SLC Modular controllers support the DH-485 communications protocol on their Channel 0 RS-232 port. So we cannot categorically state that an SLC 5/04 "is not DH485". But we also cannot state that it "is only DH+". An SLC 5/04 is potentially "both". Unless we are specifically mentioning which port we are talking about on any of these SLC controllers, we could be talking about the native Channel 1 protocol (5/03 DH-485, 5/04 DH+, 5/05 Ethernet) or the configurable Channel 0 protocol (DF1, DH-485, Modbus, etc.).