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Wiring & connectivity guidelines

Wiring & connectivity guidelines

Note
Note

The insulation class of the cables must be suitable for the intended signal voltage. Ensure that the cables used comply with the appropriate safety and operational standards for the specific voltage levels in the system.

Ethernet

The following guidelines apply:

  • Cable type: You must use CAT5e or higher cables for optimal performance. In commercial and industrial settings, it is recommended to use shielded cables.
  • Network connection: Check with your computer if you have internet on the ethernet cable before connecting it to the MidTeQ PULSE EMS or device.
  • Maximum distance: The individual cable length is limited to 100 meters. For longer distances you need a signal booster or switch.
  • Subnet: The MidTeQ PULSE EMS and the devices have to be on the same subnet to be able to communicate (e.g. a MidTeQ PULSE EMS in subnet 192.168.1.x can generally not talk with a device in subnet 192.168.200.x).
  • Outbound ports: See network configuration on firewall configurations.
Note
Note

Powerline adapters

For places in residential settings that have no ethernet cabling installed, you may consider Powerline adapters. Please note that only wall sockets that are on the same phase can be used with most powerline adapters.

Other interfaces

Tip
Tip

Additional I/O's

All MidTeQ PULSE models are extendible with additionaly I/O's through the accessories. See accessories for more information.

MidTeQ PULSE Pro (Model OM1)

Model OM1
Electrical schematic model OM1

The permissible wire cross-section for the connectors is as follows:

TypeSection (AWG)Section (mm²)
Solid Wires26-16 AWG0,129-1,31
Stranded (Flexible) Wires26-16 AWG0,129-1,31

Digital inputs & relay outputs

Warning
Warning

You MUST respect the voltage & current ratings from . Using the device outside of its rated values is dangerous and may lead to damage and injuries.

InterfaceVoltage (V)Current (A)
RelayMax. 30Vac / 50Vdc1.0 A
Digital input5-50VdcN/A
Tip
Tip

If you need the switch higher voltages or currents than what the relay is rated for, then use the relay of the MidTeQ PULSE EMS to switch another relay that has the voltage or current rating that you need.

Image

The following guidelines apply:

  • Cable type: It is recommended to use shielded cables with twisted pairs for optimal performance.

Wiring S0 Pulse Meters

Software version

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Wiring & connectivity guidelinesEthernetPowerline adaptersOther interfacesAdditional I/O'sMidTeQ PULSE Pro (Model OM1)Digital inputs & relay outputsWiring S0 Pulse MetersRS485WiringSignal MappingIn case of many devicesTermination resistor & bias resistorsAddressesMidTeQ PULSE Home (Model EDS)RS485WiringSignal MappingTermination resistorsAddresses
Passive S0 Meter Wiring Diagram

Scenario 1 (left example): Active Meter (Voltage Output) Use this wiring if the meter generates its own voltage pulse.

Scenario 2 (right example): Passive Meter (Dry Contact) Use this wiring if the meter acts as a relay/switch. The controller provides the wetting voltage (12V).

RS485

Wiring

Tip
Tip

The color of the wires does not matter. You may choose this, as long as both the A and B are from a single twisted pair.

The following guidelines apply:

  • Cable type:
    • You must use shielded cables with twisted pairs for optimal performance.
    • Use a single pair for a RS485 connection. One cable of this pair is used for RS485-A and the other one for RS485-AB. Do not split A and B over different pairs). If there is a ground wire, use another pair for the ground wire.
    • For short distances, a twisted pair from a network cable (minimum CAT5e) can be used.
    • Avoid using SVV cables or alarm cables, as they are not suitable for these purposes.
    • The cable must have a characteristic impedance of 100 to 120 ohm.

Signal Mapping

Different manufacturers use different naming conventions (A/B, +/-, D1/D0). Use this table to match your device's signals to the MidTeQ PULSE controller.

Info
RS485 Wiring
  • For correct RS485 wiring: Follow the guidelines for RS485 wiring.
  • If the wiring shown in the table below is incorrect, please let us know.
  • There is no general consensus in the industry about the usage of A and B for the RS485 polarity, so it may be counterintuitive and opposite of what you might expect for some devices.
DeviceMidTeQ PULSE EMS model OM1MidTeQ PULSE EMS model IG8RS485-USB converterRS485-Ethernet converter
RS485 ARS485_POSRS485 ATX+
RS485 BRS485_NEGRS485 BTX-
RS GNDGNDNot availableG
  • Connecting multiple devices: The cable must be daisy-chained from device to device. Place the MidTeQ PULSE EMS like the picture below.
Image 1
  • Maximum number of devices: The absolute maximum number of devices that the MidTeQ PULSE EMS supports on the same RS485 bus is 20 (provided that each device has 1/4th unit load on the RS485 bus, which almost all devices do).
  • Maximum distance: The total cable length is limited to 1000 meters - but it is recommended to limit the maximum to 100m.
  • Long Distances:
    • MidTeQ PULSE EMS model OM1: It is recommended to activate the termination resistor on the MidTeQ PULSE EMS (already active by default from the factory), and install a 120Ω termination resistor at the opposite end of the daisy chain.
    • Other MidTeQ PULSE EMS models: Install a 120Ω termination resistor at the both ends of the daisy chain.
  • Grounding the cable shield: If the cable is shielded, then you must connect the shield to the electrical earth of the installation at one end of the cable.
Tip
Tip

In case of many devices

  • If you have many devices on the RS485 bus, the control system gets slower. This is because over an RS485 bus only one device can communicate at a time.
  • For this reason we recommend connecting no more than 5 devices on the same RS485 bus.
  • If you have more devices, it is recommended to use one of the RS485 expansion accessories.
Warning
Warning

Grounding shielded cables

  • Ground the shield at a single end of the cable only. Do not ground the shield at multiple points along the cable, not even the other end of the cable. If you use a daisy chain, then ground each individual cable at a single end (you may use the shield of another cable as the grounding point at the end of the cable, but this is not recommended).
  • Ground the shield to the earth ground of the electrical installation. Do not ground it to the signal ground.

Termination resistor & bias resistors

To the left of the I/O connections on the MidTeQ PULSE EMS, there are three DIP switches for terminating and biasing the RS485 communication bus.

The correct configuration depends on the topology of the RS485 bus. In most cases, activating all resistors is the recommended choice. Do this if you are unsure. This is different if the MidTeQ PULSE EMS is not at the end of the communication bus or if another device has active bias resistors.

Image 1

Whether the resistors are active or not depends on the position of the DIP switches. To do this, you need to consider the production date of the MidTeQ PULSE EMS. You can deduce this from the serial number. The serial number starts with production code OM1, followed by six digits representing the production date. E.g. OM1240315 was produced on 15/03/2024.

If your is manufactured before 1 August 2024: (These devices have white switches coming from a black component).

  • The termination resistor is active when the corresponding DIP switch is in the down position.
  • The bias resistors are active when the corresponding DIP switches are in the down position.

If your is manufactured after 1 August 2024: (These devices have white switches coming from a red component).

  • The termination resistor is active when the corresponding DIP switch is in the up position.
  • The bias resistors are active when the corresponding DIP switches are in the up position.

Addresses

Warning
Warning

You MUST give each device on the RS485 bus a unique address.

Tip
Tip

Use lower addresses first (1, 2, ...), because the MidTeQ PULSE EMS will find them faster!

Tip
Tip

Stick with the factory default baud rate, parity and stop bits. The MidTeQ PULSE EMS will scan on those first.

MidTeQ PULSE Home (Model EDS)

Model EDS

The permissible wire cross-section for the connectors is as follows:

TypeSection (AWG)Section (mm²)
Solid Wires26-18 AWG0,129-1
Stranded (Flexible) Wires26-18 AWG0,129-1

RS485

Wiring

Tip
Tip

The color of the wires does not matter. You may choose this, as long as both the A and B are from a single twisted pair.

The following guidelines apply:

  • Cable type:
    • You must use shielded cables with twisted pairs for optimal performance.
    • Use a single pair for the RS485 A and B wires (do not split them over different pairs). If there is a ground wire, use another pair for the ground wire.
    • For short distances, a twisted pair from a network cable (minimum CAT5e) can be used.
    • Avoid using SVV cables or alarm cables, as they are not suitable for these purposes.
    • The cable must have a characteristic impedance of 100 to 120 ohm.

Signal Mapping

Different manufacturers use different naming conventions (A/B, +/-, D1/D0). Use this table to match your device's signals to the MidTeQ PULSE controller.

Info
RS485 Wiring
  • For correct RS485 wiring: Follow the guidelines for RS485 wiring.
  • If the wiring shown in the table below is incorrect, please let us know.
  • There is no general consensus in the industry about the usage of A and B for the RS485 polarity, so it may be counterintuitive and opposite of what you might expect for some devices.
DeviceMidTeQ PULSE EMS model OM1MidTeQ PULSE EMS model IG8RS485-USB converterRS485-Ethernet converter
RS485 ARS485_POSRS485 ATX+
RS485 BRS485_NEGRS485 BTX-
RS GNDGNDNot availableG
  • Connecting multiple devices: The cable must be daisy-chained from device to device. Place the MidTeQ PULSE EMS like the picture below.
Image 1
  • Maximum number of devices: The absolute maximum number of devices that the MidTeQ PULSE EMS supports on the same RS485 bus is 20 (provided that each device has 1/4th unit load on the RS485 bus, which almost all devices do).
  • Maximum distance: The total cable length is limited to 1000 meters - but it is recommended to limit the maximum to 100m.
  • Long Distances: Install a 120Ω termination resistor at the both ends of the daisy chain.
  • Grounding the cable shield: If the cable is shielded, then you must connect the shield to the electrical earth of the installation at one end of the cable.
Tip
Tip

TIP: In case of many devices

  • If you have many devices on the RS485 bus, the control system gets slower. This is because over an RS485 bus only one device can communicate at a time.
  • For this reason we recommend connecting no more than 5 devices on the same RS485 bus.
  • If you have more devices, it is recommended to use multiple RS485 ports.
Warning
Warning

Grounding shielded cables

  • Ground the shield at a single end of the cable only. Do not ground the shield at multiple points along the cable, not even the other end of the cable. If you use a daisy chain, then ground each individual cable at a single end (you may use the shield of another cable as the grounding point at the end of the cable, but this is not recommended).
  • Ground the shield to the earth ground of the electrical installation. Do not ground it to the signal ground.
Warning
Warning

Multiple ports Do not connect the same RS485 bus to multiple ports on the MidTeQ PULSE. This will introduce interference.

Termination resistors

You must install 120 ohm termination resistors on both ends of the serial communication bus. The MidTeQ PULSE does not have an integrated termination resistor.

Addresses

Warning
Warning

You MUST give each device on the RS485 bus a unique address.

Tip
Tip

Use lower addresses first (1, 2, ...), because the MidTeQ PULSE EMS will find them faster!

Tip
Tip

Stick with the factory default baud rate, parity and stop bits. The MidTeQ PULSE EMS will scan on those first.

the Specifications