瑞典采购需求：空气交换器、空气交换通风机、空气处理机组、空气-空气交换器、空气-空气热交换器、空气通风

I've been working with the HRV unit and realized that I no longer have the Modbus manual. I found it quite useful for my operations, and it seems that the last PDF you sent has gone missing from my files. If possible, could you send me a new copy directly to my email? Having access to the manual would be a big help in ensuring everything runs smoothly on my end. I appreciate your assistance with this and look forward to receiving the information soon. Thanks!