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| Opto22_trigger* | An optional parameter. If used then set the | No, Yes |
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| value of this parameter to yes or no and |
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| the da_byte_name parameter must be |
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| specified too. |
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| When this parameter is set to yes then the |
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| Optomux driver processes this map |
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| descriptor differently from a normal wrbc or |
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| rdbc function. |
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| The driver processes the map descriptor at |
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| the scan interval specified. Each time that |
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| it is processed the driver checks the |
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| element of the da_byte_name data array |
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| specified. If the value of the 1st element of |
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| array located at data_array_offset is 1 then |
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| the driver executes the command. If the |
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| value is not equal to one then the driver |
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| ignores the map descriptor. |
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| If the map descriptor is triggered then the |
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| driver will write a response status to the |
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| same data element on completion of the |
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| poll. Thus the value of 1 will be set to zero |
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| for success or some other value indicating |
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| an error. |
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| More information is provided in chapter 6. |
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| Opto22_format* | This parameter only has meaning when | Bit, Packed |
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| the function is a read of digital data. |
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| By default the OPTO22 devices returns 16 |
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| position states when digital data is read ( |
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| eg. READ STATUS). The Optomux driver |
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| writes the data as one 16 bit unsigned |
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| integer to one data element of the data |
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| array specified. (That is, the data is written |
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| to the data array in packed bit format.) |
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| For example, if the 1st and 5th inputs were |
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| on and all others were off the driver would |
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| write the value 17 to the first element of the |
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| data array. |
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| The driver can be instructed to unpack this |
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| data into separate bit states, writing each |
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| module position’s state to a consecutive |
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| data array element. |
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| When the Bit keyword is used the driver |
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| sets the states of consecutive data array |
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| elements starting at Data_Array_Offset. |
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| The number of elements that are written is |
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| determined by length and a maximum of |
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| 16 elements will be written. |
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| Opto22_function | This parameter is specified by using one of | See Table 6.1 |
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