Manual IP switch II

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← Remote relay board rev0.2 | rev0.4

Manual IP switch MK2 is delivered with two parts - IP relay diver KIT (needs to assemble) and assembled IP control. Both parts have firmware installed and automaticaly pair in local network with available DHCP server.

Quick start guide in two step

Manual IP switch is consists of two parts

  1. IP Switch relay driver KIT
    • Assembly KIT by this instructions rev0.2 | rev0.4.
    • Connect ethernet to local LAN with available DHCP server
    • Connect DC Power
      • rev 0.2 5V DC adapter - higher voltage damage both electronics!
      • rev 0.4 12V DC
    • Set NET-ID-sufix with BCD switch in the range 0-7, for example 0.
  1. IP control
    • This part is assembled and tested.
    • Connect ethernet to local LAN with available DHCP server
    • Set NET-ID-sufix with bottom side BCD switch in the range 0-7, the number must be the same as on IP-switch relay driver.
    • Connect micro USB cable for power supply.
    • Wait to pair and start to use.

The hardware

  • IP Switch relay driver KIT is on its own page rev0.2 | rev0.4.
  • IP control

  • 1 - rotary Encoder switch one from 2-16 outputs
  • 2 - status LCD display
    • Points in the first row indicate the scope of the encoder.
  • 3 - NET-ID BCD, switch sufix in range 0-7
  • 4 - 25 pin D-SUB No longer present and supported
    • PIN-1 DC power, typicaly 13,8V from transceiver
    • PIN-18 PTT input
    • PIN-14 GND
  • 5 - Ethernet
  • 6 - micro USB for upload firmware or power
  • 7 - eight light button - light after receive confirming from remote relay


Pinouts 25 pin D-SUB No longer present and supported

pin-1 in Input power 8-18V DC from Transceiver
pin-2 in ICOM CI-V
pin-3 out TXD TTL
pin-4 out TXD TTL inverted
pin-5 out TXD 232 level
pin-6 out PTT output
pin-7 out Relay 2
pin-8 out Relay 4
pin-9 out Relay 6
pin-10 out Relay 8
pin-11 in/out BCD4
pin-12 in/out BCD2
pin-13 in AZ
pin-14 - GND
pin-15 in RXD TTL
pin-16 in RXD TTL inverted
pin-17 in RXD 232 level
pin-18 in PTT in
pin-19 out Relay 1
pin-20 out Relay 3
pin-21 out Relay 5
pin-22 out Relay 7
pin-23 out +5V
pin-24 in/out BCD3
pin-25 in/out BCD1
shield - GND


Compile from source

  1. Download and install Arduino IDE
  2. Install library
    1. Wire
    2. LiquidCrystal_I2C or LiquidCrystal_PCF8574 or LiquidCrystal_I2C
    3. Ethernet
    4. EthernetUdp
    5. SPI
    6. EEPROM
  3. Download Manual IP switch firmware source from GitHub
  4. Connect micro USB cable between IP control and PC
  5. Configure... (more in the chapter below)
  6. Select menu Tools/Board:Arduino Nano
  7. Select menu Tools/Processor:ATmega328P (Old Bootloader)
  8. Select menu Tools/Port/YOUR-CONNECTED-PORT
  9. Upload firmware

Upload default binary (Windows only)

Does not allow configuration firmware, only CLI

  1. Download Xloader for Windows
  2. Download latest .hex from GitHub
  3. Connect micro USB and upload it


Control box

May be preset via CLI (command line interface). How to access

  • connect micro USB cable
  • run terminal - for example Ctrl+Shift+M in Arduino IDE
  • set baudrate to 115200 and No line ending.

CLI contains some commands for set or show information.

  • ? - show status
  • / - enable/disable trasfer PTT (pin 18 on D-SUB connector) as one button (default number 8), may be change in firmware source edited with line
    byte ButtonUseForPttTransfer= 8;  // 1-8
  • . - Listing detected/stored ip-relay by ID sufix, for switching between it
  • + - Switch between source of network ID sufix eeprom/BCD switch
  • # - set network ID prefix (four high bit) in hexadecimal format (0-f).
  • & - send broadcast packet for find relay devices in local network

Relay driver

Is configure via Telnet



In last firmware NET-ID may be configure from CLI

contains from two parts and defined pair device in network

  • Prefix (four high bit) in hexadecimal format (0-f) set from CLI
    • in standart mode prefix expanded range of network ID
    • if enable Multi control, diffrent for each master device for his idetifications
  • Sufix (four low bit) in hexadecimal format (0-f)
      • get from eeprom (0-f) or BCD switch (0-7) depenency to preset in CLI
      • in standart mode sufix diffrent for each device
      • in Multi control mode same, for all shared devices (group id)

Remotely IP address and UDP port

ouside from local network write directly to firmware. IP control use this address according to the setting NET-ID sufix (BCD switch or CLI). For remote operation need public IP or VPN

{0,0,0,0, 0}, // IP:port ID 0
  {0,0,0,0, 0},   // IP:port ID 1
  {0,0,0,0, 0},   // IP:port ID 2
  {0,0,0,0, 0},   // IP:port ID 3
  {0,0,0,0, 0},   // IP:port ID 4
  {0,0,0,0, 0},   // IP:port ID 5
  {0,0,0,0, 0},   // IP:port ID 6
{78,111,124,210, 88}, // IP:port ID 7 - remoteqth test point

I2C display address

need preset in firmware

#define LcdI2Caddress  0x27
The most common are values 0x27 or 0x3F. If display dont work

  • Select I2C LCD chip
    • If type of chip is PCF8574AT
      • Install library LiquidCrystal_I2C
      • Disable line
        // #define LCD_PCF8574T
    • If type of chip is PCF8574T
      • Install library LiquidCrystal_PCF8574
      • Enable line
        #define LCD_PCF8574T

Fast power up

  • without shown LCD information enable with
    #define FastBoot

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← Web

← Remote relay board rev0.2 | rev0.4