Rhonmac-cnc Specifications:                 Additional Options

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Part No BK1. Part No BK1. Compatible with Mach3 and EMC2 and other control software.

RM2-25DB (Male & Female) Data Sheet     Dimensions in Inches


Available Connections 25

·        25 screw terminals

·        3 available ground screw terminal positions

·        Foot or panel mounting


Ambient Temperature

-20°C to 85°C

Ambient Humidity

10% to 90% RH, non-condensing


200V maximum between any two signals

Continuous Current

1.5A maximum on any signal

Screw Terminal Size

Accepts 16 - 26 AWG wire

Issue 1 November 2006


RM1-9-M (Male) Breakout Board



RELB2 & RELB4 Relay Board Data Sheet    Dimensions in Inches


Screw Terminal Wire Size

·      Input control signals and Power: 16-26 AWG

·      Relay contacts: 12-24 AWG

DC Power Jack (if a DC power supply is used via a power jack plug the plug must connect as below)

The DC power jack accepts connectors with a 2.1mm inside diameter and 5.5mm outside diameter. The jack requires a centre-positive supply.

Electrical Characteristics




DC Power Supply Input Range

4.8 - 7.5


Nominal relay coil current per activated relay 5 Volts



Maximum leakage current

(power supply current with no relays activated)



Minimum turn-off threshold for input control signals (see diagram)



Maximum turn-on threshold for input control signals (see diagram)

2 .7


Maximum allowable input control signal voltage



Input control signal current requirement, typical (per channel)

Input signal @ 2.7V

Input signal @ 5.0V




Relay contact rating @ 250 V AC



DC Breaking Capacity of Relay Contacts

Operating Conditions

Ambient Temperature Range

-25~C to 75~C

Relative Humidity Range - not freezing or condensing

5% to 85% 

RELB5HD Relay Board Data Sheet

RELB5HD Heavy Duty Relay Board


This AC output drive can be used for controlling your AC devices. It is easily connected and will work with 220Vac or 110Vac.


Main Features
Opto-Isolated Inputs.
Isolates input connections to protect your computer from shorts circuits. An opto-isolator is an integrated circuit that transmits the signal through an encapsulated LED and photo-transistor, when the signal is present, the LED lights, and the photo-transistor captures it, and relays the signal. That way your computer’s electronics is completely isolated from your circuitry.

All TTL +5VDC or +3.3VDC Signals.
Interface directly with parallel port interface products and other cards. 5VDC (TTL) signals are very common among automation devices.

Works With the Parallel Port Breakout Board.
Connect easily with the Parallel Interface Board, or any port pin.

Works directly with popular CNC hardware and software. . Such as Geckodrive, DeskCNC or Rutex, and parallel port control software, such as Cambam, mach2, Linux EMC, TurboCNC, CNCPlayer, CNCZeus and others (Not all tested)

Controls 4 AC devices per card.

Outputs 3 at 10amp and 1 x 30 amp. Keep in mind that motors can draw up to 3 times as much current on startup. Use ˝ the rated current when using this device w=at 220Vac.

Independent fuses for each connection.

Comes with an RJ45 Connector fast installation. With this connector you just have to plug in an standard RJ45 cable and will not require further wiring.

You can use as many cards as you need as long as you have enough output signals to switch the circuits. Connect inputs in parallel to enable more than one switch with one input signal as long as your desired function will allow. 


Use the 30 amp circuit for motors up to 12 amps and the 10 amp circuits for motors and devices up 5 amps.

When using 220Vac use only ˝ the recommended amperage. Keep in mind that motors can draw up to 3 times the rated current on startup.


This card works as a set of 4 normally open switches that enables connection if power is supplied to the card and a signal is provided to the appropriate input pin.

This card will only work with AC devises



















For further information please e.mail sales@rhonmac-cnc.co.uk


CNC machines can be dangerous, they are designed to operate without human interference, this, in itself makes a cnc machine inherently dangerous.

Engineers Tool Room or Rhonmac-cnc cannot accept any responsibility for loss or injury while you are using the machine you have built when using equipment purchased from us. Furthermore if you are not competent with electrical installation and working with mains power you must engage an electrical engineer to carry out the work you cannot do. 

Do not forget electricity can KILL.

We strongly recommend that you build into your electronic control circuitry emergency stops and you fit appropriate guarding to the machine. It is also advised that when you design your electronic control circuit you build into your machine axis movement limit switches to prevent damage to the machine in the event of an over travel on an axis and you also build in emergency stops that kill the power of the machine and your controller

Our policy is one of continual improvement therefore specifications may change without notice. Pictorial representations are intended as a guide only and may vary depending on machine model or product offered.