Honeywell TC300

Power supply guidelines and requirements 23
Terminal identification
Fig 12. Thermostat terminal assignments
Do NOT wire the thermostat to line voltage.
Table 2 Terminal identification
Terminal Name Terminal Label Description
UIO1 UIO1 Universal input/output
COM COM Common
UIO2 UIO2 Universal input/output
COM COM Common
UIO3 UIO3 Universal input/output
RS485 SLAVE - BACnet/Modbus Communications
RS485 SLAVE + BACnet/Modbus Communications
SYLK MASTER Sylk bus
SYLK MASTER Sylk bus
DO1 DO1 Configurable relay output
DO2 DO2 Configurable relay output
DO3 DO3 Configurable relay output
DIO1 DIO1 Configurable relay output, configurable
analog/relay input
DIO2 DIO2 Configurable relay output, configurable
analog/relay input