Devantech ETH008
 | |
| Status | supported |
|---|---|
| Source code | devantech-eth008 |
| Channels | 2..20 |
| Ratings | 16A 250VAC / 16A 24VDC |
| Connectivity | Ethernet/Wifi, TCP |
| Website | robot-electronics.co.uk |
The Devantech ETH008 is an Ethernet attached relay card with 8 relays. Models with 2 up to 20 relays exist, as do Wifi models. Some models additionally provide digital input and analog input. Their protocols are assumed to be similar enough to the ETH008 model which was used to create the sigrok driver. Their operation has yet to get verified.
The firmware supports several ways of communication: interactive web forms, HTTP GET, binary over TCP, text over TCP. The sigrok driver uses binary payloads for simplicity and for maximum compatibility across firmware versions. Password protection for TCP sockets is currently not supported.
There are several models in the series of cards, with differing degrees of support. It is assumed that WLAN capable models share their ID with Ethernet devices.
| Device name | DO | DI | AI | supported | comment |
|---|---|---|---|---|---|
| ETH002 | 2 | — | — | untested | — |
| ETH008 | 8 | — | — | tested | — |
| ETH484 | 12 | 8 | 4 | untested | lacks R5..R8 |
| ETH8020 | 20 | 8 | 8 | untested | — |
| ETH1610 | 10 | 16 | 16 | unsupported | model ID unknown |
Hardware
- PIC32MZ microcontroller, S25F32 SPI flash
- SMSC Ethernet chip, Fast Ethernet (100Mbps)
- Rohm BD9703 switching regulator, 2.1mm barrel jack
- Hongfa HF115FD relays, screw terminals with common and NC and NO
- discrete transistors and LED indicators per relay channel
- power LED and RJ45 indicators
Nominal supply for the relay card is 12V. The Rohm regulator accepts 8V..35V. The HF115 relay may accept 24V, too. But the PIC measures the card's supply by means of a voltage divider, which most probably constrains the acceptable range of supply voltages for the card.
Voltage and current capability of the relay heavily depends on AC/DC kinds and the types of load. Rating is much lower for DC and for inductive loads. See the card vendor's relay power rating discussion and relay datasheet.
Photos
ETH008-B top
ETH008-B bottom
ETH008-B top, PIC MCU, SMSC Ethernet
Example use
Detect the device and display its properties.
$ DEV=devantech-eth008:conn=tcp-raw/192.168.0.200/17494 $ sigrok-cli -d $DEV --scan The following devices were found: devantech-eth008:conn=tcp-raw/192.168.0.200/17494 - Devantech ETH008 HW2 FW23 [S/N: fc0fe7123456]
$ sigrok-cli -d $DEV --show
Driver functions:
Multiplexer
Scan options:
conn
devantech-eth008:conn=tcp-raw/192.168.0.200/17494 - Devantech ETH008 HW2 FW23 [S/N: fc0fe7123456]
Channel groups:
DO1: channel
DO2: channel
DO3: channel
DO4: channel
DO5: channel
DO6: channel
DO7: channel
DO8: channel
Supported configuration options across all channel groups:
conn: tcp-raw/192.168.0.200/17494 (current)
enabled: on, off
Display the relay state.
$ DEV=devantech-eth008:conn=tcp-raw/192.168.0.200/17494 devantech-eth008 $ sigrok-cli -d $DEV --get channel_group=DO1:enabled --get channel_group=DO2:enabled --get channel_group=DO3:enabled --get channel_group=DO4:enabled true false false true
Manipulate the state of relays. Address one individual relay per infocation. Address several channels in the same invocation. Set all relays of a card at the same time.
$ DEV=devantech-eth008:conn=tcp-raw/192.168.0.200/17494 devantech-eth008 $ sigrok-cli -d $DEV -g DO8 --config enabled=on --set $ sigrok-cli -d $DEV --config channel_group=DO1:enabled=off --config channel_group=DO2:enabled=on --set $ sigrok-cli -d $DEV --config enabled=on --set $ sigrok-cli -d $DEV --config enabled=off --set
Resources
- robot-electronics.co.uk shop product page
- vendor documentation as PDF discusses the device's capabilities and its communication protocols, links to [http://www.robot-electronics.co.uk/files/HF115FD.pdf Hongfa relay datasheet
- github repo contains Python code, API documentation at the github.io page