# RC7620 needs to send commands 2~3 times before responding

**URL:** <https://forum.sierrawireless.com/t/rc7620-needs-to-send-commands-2-3-times-before-responding/26531>\
**Category:** RC76\
**Created:** [March 11, 2022, 7:02am UTC](https://forum.sierrawireless.com/t/rc7620-needs-to-send-commands-2-3-times-before-responding/26531 "2022-03-11T07:02:52Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jerry1](https://avatars.discourse-cdn.com/v4/letter/j/8c91f0/32.png) [@jerry1](https://forum.sierrawireless.com/u/jerry1)\
**Post date:** [March 11, 2022, 7:02am UTC](https://forum.sierrawireless.com/t/rc7620-needs-to-send-commands-2-3-times-before-responding/26531/1 "2022-03-11T07:02:52Z")

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Hi

I use RC7620 module UART interface send AT command.  
Always need to send commands 2~3 times before responding.  
But this is not the case when using the USB interface.  
Please advise how to process it.Thanks

 ![image](https://us1.discourse-cdn.com/flex025/uploads/sierrawireless/original/2X/1/10b1cefe142bbff5bd2ba8f93b3fa192624f743a.png)

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**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\
**Post date:** [March 11, 2022, 7:10am UTC](https://forum.sierrawireless.com/t/rc7620-needs-to-send-commands-2-3-times-before-responding/26531/2 "2022-03-11T07:10:14Z")

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you can set the +KSLEEP to not to sleep and retry

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**Author:** ![jerry1](https://avatars.discourse-cdn.com/v4/letter/j/8c91f0/32.png) [@jerry1](https://forum.sierrawireless.com/u/jerry1)\
**Post date:** [March 11, 2022, 7:16am UTC](https://forum.sierrawireless.com/t/rc7620-needs-to-send-commands-2-3-times-before-responding/26531/3 "2022-03-11T07:16:51Z")

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Hi @jyijyi

Thanks. The problem is solved.  
I used AT+KSLEEP=2