Inputs and Outputs - HMD65 - HMD60

HMD65 Quick Guide

Document code
English (United States)
Document type
User guide
Table 1. HMD65 Inputs and Outputs
Property Specification
Analog output
  • 1 x RH output 1, 0 … 10 V
  • 1 x T output, 0 … 10 V
  • Load resistance: 10 kΩ min.
Digital output (RS-485) Isolated, supports Modbus RTU and BACnet MS/TP protocols
BACnet MS/TP Address range: 0 … 127 (master mode only)
Modbus RTU Address range: 1 … 247

Power supply input

Using a power supply with overload protection is recommended for electrical safety.

15 … 35 VDC

16 … 24 VAC

Power consumption 1.0 W (typical, for both AC and DC)
Service port connector M8 4-pin male connector for MI70 hand-held indicator (requires cable accessory 219980SP) or Vaisala Insight PC software cable connection (requires USB cable accessory 219690) 2
Cable lead-throughs
  • M16 x 1.5 lead-through, options available from Vaisala:
    • Cable Gland M16x1.5 (Vaisala order code: 254280SP). This is the default option delivered with the transmitter.
    • Conduit Fitting M16x1.5, ½”NPT (Vaisala order code: 210675SP)
  • Alternative M20 x 1.5 lead-through
Screw terminal wire size 0.5 ... 2.5 mm2
CAUTION Do not modify the unit or use it in ways not described in the documentation. Improper modification may lead to safety hazards, equipment damage, failure to perform according to specification, or decreased equipment lifetime.
1 Available calculated parameters for HMD65 include Td, Tdf, A, X, Tw, and H.
2 Vaisala Insight software for Windows available at