This document describes the RS422/485 ASCII communications option for the UDC 2300, UDC 3000, UDC 3300, UDC 5000, UDC 6000, and UDC 6300 Universal Digital Controllers.
The RS422/485 ASCII Communications Option adds serial networking capability to Honeywell Universal Digital Controllers (UDC 2300, 3000, 3300, 5000, 6000, 6300). It enables one‑parameter‑at‑a‑time read and write operations using standard RS‑422/485 hardware.
The manual covers an overview of the option, installation steps, communication setup, read/write procedures, parameter override for each UDC model, operating instructions, an ASCII conversion table, and cable specifications required for reliable communication.
| Characteristic Impedance | 124 Ω (2000 ft cable) / 150 Ω (5000 ft cable) |
|---|---|
| Cable Capacitance | 40 pF/m (2000 ft) / 28.9 pF/m (5000 ft) |
| Attenuation at 1 MHz | 2 dB/100 m (2000 ft) / 0.98 dB/100 m (5000 ft) |
| Operating Temperature Range | -20 °C to 80 °C (‑4 °F to 176 °F) |
| Maximum Number of Devices | 15 |
| Supported Baud Rate | 19.2 kbps |
A maximum of 15 devices can be connected to the RS422/485 network.
The option operates at a baud rate of 19.2 kbps.