With the UT55A, UT75A, and UP55A, is there a difference between selecting RS485 communication with the 2nd digit of thesuffix code versus the 3rd digit?

Yes. The communication protocol is the same, but note the difference below. You can also install two systems for use with separate protocols.
The maximum speed of RS485 communication using the 2nd digit of the specification code is 19.2 kbps. The UT55A with the /LP option (power supply for 24 V sensor) and the UT75A are 2-wire systems. The maximum speed of RS485 communication using the 3rd digit of the specification code is 38.4 kbps. You can use both 2-wire or 4-wire systems.

Related Products & Solutions

Advanced Application UT75A

The UT75A temperature controllers employ an easy-to-read, 14-segment large color LCD display, along with navigation keys, thus greatly increasing the monitoring and operating capabilities. A ladder sequence function is included as standard. The short depth of the controller helps save instrument panel space. The UT75A also support open networks such as Ethernet communication.

Mid-level UT55A/UT52A

The UT55A and UT52A temperature controllers employ an easy-to-read, 14-segment large color LCD display, along with navigation keys, thus greatly increasing the monitoring and operating capabilities. A ladder sequence function is included as standard. The short depth of the controller helps save instrument panel space. The UT55A/UT52A also support open networks such as Ethernet communication.

UP55A

The UP55A is a newly-released 1/4 DIN sized program controller provides up to 30 program patterns, and simultaneous monitoring of 8 PV events, 16 time events, and 8 alarms. Also a ladder sequence function is included as standard.

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