英语翻译exchange of proximity switch against light curtain请问这里against是什么意思?

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• 英语翻译exchange of proximity switch against light curtain请问这里against是什么意思?
• 英语翻译原句：Setting off the payment against other than undisputed or judicially determined counterclaims shall require an expressly written agreement.我把它翻译成“不是根据毫无争议的或司法确定的反索赔进行的付款应要求一份明确的书面协议。”不知是否正确？
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