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This article describes the CHESTER-X3A, CHESTER-X3B and CHESTER-X3C extension modules.

CHESTER-X3A Module Overview

CHESTER-X3A provides 2 inputs for RTD (resistive temperature devices) sensors, such as Pt 100 and Pt 1000. Each input supports 4 wire sensor connection to improve the accuracy.

CHESTER-X3B Module Overview

CHESTER-X3B allows connecting 2 type-N thermocouples (types B/C/E/J/K/R/S/T support on request) using 2 wire sensor connection.

First sensor connects to CH1A(-) and CH1B(+). If X3B is in the slot A, then you have to use terminals A2(-) and A3(+).

The second sensor connects to CH2A(-) and CH2B(+). If X3B is in the slot A, then you have to use terminals A6(-) and A7(+).

CHESTER-X3C Module Overview

CHESTER-X3C provides 2 inputs for load-cell (strain gauge) that can be used for weight measurements. Each channel use 4 wire connection.

CHESTER Pin Configuration Diagram

Pin Configuration and Functions

PositionSignal NameSignal Description
1CH1PChannel 1: sensor positive supply
2CH1AChannel 1: sensor input A
3CH1BChannel 1: sensor input B
4CH1MChannel 1: sensor negative supply
5CH2PChannel 2: sensor positive supply
6CH2AChannel 2: sensor input A
7CH2BChannel 2: sensor input B
8CH2MChannel 2: sensor negative supply

Schematic diagram

A schematic diagram is useful if you program low-level hardware-related code or if you're just curious about how the system is designed.

Module Drawing