---
title: "What status is W5100 Status Register Sn_SR indicating?"
url: "https://maker.wiznet.io/forum/11453"
markdown_url: "https://maker.wiznet.io/forum/11453/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "ogawakazuhito"
created: "2015-11-10T03:04:25+09:00"
last_activity: "2017-05-04T08:37:29+09:00"
language: "en"
views: 643
replies: 2
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# What status is W5100 Status Register Sn_SR indicating?

## Question

Asked by ogawakazuhito on 2015-11-10 in Ethernet Chips.

What status is the value 0x01 of W5100 Status Register Sn_SR indicating?
The value 0x01 of Sn_SR is not specified in anywhere of W5100 datasheet.
When I have connected W5100 with TCP client mode to TCP server, then
the status register Sn_SR of W5100 has returned the value 0x01.
What meaning is the value 0x01 of Sn_SR?
Please teach me these phenamina in detail.

## Replies

### Reply 1 by Edward, 2015-11-10

Hi.

It is SOCK_ARP mode.

please check to W5100 datasheet 30page to Sn_SR tap.

W5100 datasheet bellow link
[wiznet.co.kr/wp-content/uplo … v1.2.6.pdf](http://www.wiznet.co.kr/wp-content/uploads/wiznethome/Chip/W5100/Document/W5100_Datasheet_v1.2.6.pdf)

Thank you

### Reply 2 by ogawakazuhito, 2015-11-10

Hello

Thank you for your answer.
I got cleared up my problem.

Regards, K.Ogawa

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Source: https://maker.wiznet.io/forum/11453