ModBus协议-功能码-0x0F

15 (0x0F) Write Multiple Coils
This function code is used to force each coil in a sequence of coils to either ON or OFF in a remote device. The Request PDU specifies the coil references to be forced. Coils are addressed starting at zero. Therefore coil numbered 1 is addressed as 0. The requested ON/OFF states are specified by contents of the request data field. A logical ' 1' in a bit position of the field requests the corresponding output to be ON. A logical '0' requests it to be OFF. The normal response returns the function code, starting address, and quantity of coils forced.

Here is an example of a request to write a series of 10 coils starting at coil 20:The request data contents are two bytes: CD 01 hex (1100 1101 0000 0001 binary). The binary bits correspond to the outputs in the following way:
Bit: 1 1 0 0 1 1 0 1 0 0 0 0 0 0 0 1
Output: 27 26 25 24 23 22 21 20 – – – – – – 29 28
The first byte transmitted (CD hex) addresses outputs 27-20, with the least significant bit addressing the lowest output (20) in this set.The next byte transmitted (01 hex) addresses outputs 29-28, with the least significant bit addressing the lowest output (28) in this set. Unused bits in the last data byte should be zero–filled.

最后

以上就是自信星月为你收集整理的ModBus协议-功能码-0x0F的全部内容，希望文章能够帮你解决ModBus协议-功能码-0x0F所遇到的程序开发问题。

如果觉得靠谱客网站的内容还不错，欢迎将靠谱客网站推荐给程序员好友。