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WIZnet Serial to Ethernet(S2E) module based on W7500 chip, WIZ107/108SR S2E compatible device
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Libraries * Fixed pin mapping : Dec 3, 2019
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ioLibrary V1.3.0 Nov 18, 2019
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WIZnet Serial to Ethernet(S2E) module based on W7500 chip, WIZ107/108SR S2E compatible device

  • 48(W) x 30mm(L) x 18mm(H)

## WIZ750SR EVB (Separate purchases)

  • WIZ750SR Developer Board
  • USB to UART chip, CP2104
  • RESET Tact Switch
  • BOOT0 Slide Switch
  • H/W Trig Slide Switch
  • Buttons/LEDs for Expansion GPIO TEST (Digital / Analog)
  • Micro USB Connector
  • WIZ750SR-EVB (TTL/RS232)
  • RS-232C Connector, D-SUB9-MALE.
  • WIZ750SR-EVB (RS422/485)
  • RS-422/485 Connector, ECH381R.

For more details, please refer to WIZ750SR Wiki page in WIZnet Wiki.


  • WIZnet W7500P Hardwired TCP/IP SoC chip
    • Hardwired TCP/IP Core
    • The one-chip solution which integrates an ARM Cortex-M0
    • Embedded PHY(IC plus IP101G)
    • Hardwired TCP/IP stack supports TCP, UDP, IPv4, ICMP, ARP, IGMP, and PPPoE protocols
    • Easy to implement the other network protocols
  • Software and Hardware compatible with WIZ107/108SR S2E Module
  • The modules is available in three versions:
    • WIZ750SR-TTL: TTL Version
    • WIZ750SR-RS232: RS-232 Version
    • WIZ750SR-RS485: RS-485/422 Version
  • For more details, please refer to the WIZ750SR Wiki page

Hardware material, Documents and Others

Various materials are could be found at WIZ750SR Wiki page in WIZnet Wiki.

  • Documents
    • Overview
    • Getting Started Guide
    • User's Manual
    • Configuration Tool Manual
    • Command Manual
    • Trouble Shooting
  • Technical Reference (Datasheet)
    • Hardware Specification
    • Electrical Characteristics
    • Reference Schematic & Parts
    • Dimension


These are Firmware projects (source code) based on Keil IDE for ARM (version 5)


Update History

v1.3.2 Stable

  • Bug fixes:
    • Fixed pin mapping : DSR pin of WizZ750SR-100/105/110

v1.3.1 Stable

  • Bug fixes:
    • When exception situation of TCP Connection - Class C private IP When the module IP and Remote IP is 192.168.xx.xx and third ip is different for each, ARP request operation is not transmitted.(This part had deleted)

v1.3.0 Stable

  • Bug fixes:
    • When APP firmware is uploading using the configuration Tool and Board is power off, the product not operate.
    • DHCP Lease Time : when DHCP_DEBUG enable, DHCP Lease Time is fixed as 10 second.
      • DHCP lease time is modified to use it that information of received packet from DHCP Server.
    • The Status LED(PA_07) of WIZ750SR_1xx doesn't operate.
      • The Status LED(PA_07) of WIZ750SR_1xx is modified. Turning on an LED and making it blink once per second.
    • Compare DHCP Server IP : When DHCP OFFER Packet receive from DHCP Server,the DHCP server ip in packet compare with previous DHCP Server IP.
  • Improvements:
    • The ISR address have changed to fixed address. The ISR address of APP did no more have to need copy and use in Boot.


  • V1.2 Boot + V1.2.x App : Working
  • V1.2 Boot + V1.3.x App : Working
  • V1.3 Boot + V1.3.x App : Working
  • V1.3 Boot + V1.2.x App : Not Working

v1.2.8 Stable

  • Bug fixes:
    • Fixed pin mapping : DSR pin of WizZ750SR-100/105/110

v1.2.7 Stable

  • Bug fixes: All bug fixed described at upper v1.3.0 and v1.3.1 except Impovements.

v1.2.6 Stable

  • Bug fixes:

    • If serial data packing 'time' option is less than 500ms, the first serial data(+++) ignored in GW mode.
  • Improvements:

    • While IP address allocate using DHCP, the device can be made searchable using the Configuration tool and it can change the mode(AT mode <-> GW mode).
      • While IP address is allocating using DHCP , it can change the AT mode. It can show that the status of channel change from ATmode to OPEN in Configuration tool. So AT command didn't operate.

v1.2.5 Stable

  • Bug fixes:

    • Modyfied the setSn_DHAR() Address offset.
    • Modyfied the WIZ750SR-110 HW_Trigger pin.
  • Improvements:

    • If remote ip address is multicast address, enable multicating and set Sn_DHAR, Sn_DIPR, Sn_DPORTR before open socket

v1.2.4 Stable

  • Bug fixes:

    • Serial data packing 'time' option does not work if serial command mode switching code is disabled.
    • Fixed typo of debug message
  • Improvements

    • Added the PHY init stabilization code
    • Restore TCP connection status function to Status Pin (WIZ750SR-100/105/110 only)
      • The Status pin now acts as an 'HW_Trigger' pin(Input at booting) and a TCP connection status pin(output).

v1.2.3 Stable

  • Bug Fixes:

    • Fixed an issue where the pin states could not be saved correctly if the user's GPIO is set to 'Digital Output'
  • Improvements:

    • From this version, AppBoot mode supports TCP unicast search function
      • Until the previous version, AppBoot mode only supported the UDP search function
      • This is an enhancement to enable firmware update even in device control using TCP unicast search function in new configuration tool
  • Changes:

    • The function of the STATUS pin that was responsible for the TCP connection status indicator function has been changed to Command mode switch trigger pin (HW_Trigger).
      • This changes only apply to the WIZ750SR-1xx product family (WIZ750SR-100/105/110, change to maintain compatibility with WIZ100SR)
      • The HW_Trigger pin up to v1.2.2 will no longer work with v1.2.3. The STATUS pin acts as the HW_Trigger.

v1.2.2 Stable

  • Bug Fixes:
    • Stabilize the network operation of the W7500P devices
    • Error in setting function in App_Boot mode due to 'TR', 'SC' command processing failure
    • Applied the missing TCP retransmission timeout-value change

v1.2.2 Pre-release

  • Bug Fixes:

    • Internal bug fixing (PHY init)
    • Char serial packing option(delimiter) setting does not correctly apply some hex codes
  • Improvements:

    • Changed the location of the flash erase operation function during network firmware update
      • Now the application area flash memory is erased after socket establishment of TCP connection for the firmware update
    • Extended serial debug message added:
      • If this option is selected, users can check the sent and received data via the serial debug port. (WIZnet S2E tool GUI version 0.4.0 or later)
  • Changes:

    • Changed the TCP retransmission timeout-value from 250ms to 200ms(return to default value)
      • The TCP timeout can be adjusted by the TCP retransmission retry count added in firmware version 1.2.0.


  • Improvements:
    • Enhanced operational stability when performing configuration data save and factory reset functions

v1.2.1 Pre-release

  • Bug Fixes:
    • 'Character' of serial data packing option is not set correctly


  • Bug Fixes:
    • Data loss problem due to unintended delay in RS-485 mode (WIZ750SR-RS485 only)
    • Incorrect command processing problem: If the processing of a command set containing unsupported commands via Ethernet is sent to WIZ750SR, the device only responds a result until the error occurs
  • Improvements:
    • Command added:
      • TR: TCP retransmission retry count adjustment function(WR, param range: 1 ~ 255)
      • BU: AppBoot update function (WO)
    • Changed the firmware update mechanism:
      • The app-backup area is no longer used and flash update operation is only performed in AppBoot mode
    • Now an error message about command processing will be output only during serial command mode operation
  • Known Issues:
    • 'Character' of serial data packing option is not set correctly
      • This issue will be fixed in firmware version 1.2.1


  • Bug Fixes:
    • MAC address changed problem when device settings are saved (very occasionally)
    • Delayed response to search in config-tool when connecting to server in TCP client mode
    • Force socket close when fw update fails occurred
  • Improvements:
    • Supports serial baudrate up to 460.8kbps
    • Added device profiles of WIZ750SR-1xx series to project source code


  • Bug Fixes:
    • Firmware update timeout function error in AppBoot mode
    • 10M Ethernet fixed error (W7500P only)
    • Invalid parameter of FW command (firmware update)
  • Improvements:
    • Command added: AppBoot mode switching function(AB)
    • Initial boot latency(1500ms) has been removed


  • First release : 2016
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