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considered to be selected and the operation can proceed. If the value is zero, the driver rejects the command. If the secondary Data Array is not specified, the port is considered to be permanently selected.
The driver supports the following Control Codes
Code | Operation | Supported |
0 | Null | No |
1 | Pulse On | No |
2 | Pulse Off | No |
3 | Latch On | Yes |
4 | Latch Off | Yes |
Undefined | N/A |
‘Direct Operate’ and ‘Direct Operate with No Acknowledgement’ Commands
The driver does not check if the data object had previously been selected. The supported Control Codes are described above.
Analog Output Block
When a ‘Select’ command is received the driver sets the select flag in a secondary Data Array defined by the “DA_Bit_Name” parameter, if available. When any of the operate commands are received the driver stores the value sent with the command in the Data Array defined on the Map Descriptor.
Control Relay Block (Object=12)
If the Control Code is supported the driver does the required action.
The driver supports the following Control Codes
Code | Operation | Supported |
0 | Null | Not Supported |
1 | Pulse On | Not Supported |
2 | Pulse Off | Not Supported |
3 | Latch On | Driver sets Data Array value to ‘1’ |
4 | Latch Off | Driver sets Data Array value to ‘0’ |
Undefined | N/A |
If the “DA_Bit_Name” parameter is specified then the driver stores the control code as extracted from the command and if the “DA_Byte_Name” is specified then the driver stores the count field, extracted from the command message.
Pattern Control Block
Object 12 variations 2 & 3 are not supported by the driver.
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