Introduction to Indigo200 transmitters - GMP251 - INDIGO200SERIES

GMP251 User Guide

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User guide
Figure 1. Indigo201 with and without display

Vaisala Indigo200 transmitters are a plug-and-play host device platform for Vaisala Indigo-compatible probes. Indigo transmitters extend the feature set of connected probes with a range of additional options for outputs, measurement viewing, status monitoring, and configuration interface access.

Depending on the Indigo200 transmitter model, a display is available as an optional selection or as a standard feature. In the non-display model, an LED indicator is used for notifications. Probes can be connected either directly on the transmitter from the probe's connector, or by using a cable between Indigo and the probe.

For easy access to configuration and additional monitoring options, the transmitter can be connected to Vaisala Insight PC software with a USB cable.

The Indigo201 transmitter is designed for analog output applications. The transmitter's output options include 3 analog output channels (current or voltage) and 2 relays.

The Indigo202 transmitter is designed for digital output applications. The transmitter's output options include RS-485 Modbus RTU and 2 programmable relays.

Note that Indigo200 transmitters switched from a WLAN configuration interface to a USB-C cable configuration interface (Vaisala Insight PC software) in 2022. For instructions on configuring GMP251 probes with the earlier WLAN interface, see the earlier GMP251 User Guide revision M211799EN-G, available at

For more information on Indigo transmitter models, see