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Overview
Connection related OPC items have several items that are common to all types of connections and several that are unique to the connection type.
Items Common To All Connections
| Item Name | Data Type | Description |
|---|
| ClosePort | BOOL | Writing a 1 to this item will make ACM close the port after the current transaction has finished. This may take some time if the current transaction is an archive history collection. |
| Description | String | This item displays the string entered into the Description textbox of the object. |
Serial Connection Items
| Item Name | Data Type | Description |
|---|
| COMM_SYSTEMERROR | I4 | Displays the current state of the channel. Read Only. |
| ConnectState | I2 | Displays the current state of the channel. Read Only. |
| CurrentUser | String | Displays the name of the device that is currently communicating on the port. Read Only. |
| Hangup | Bool | Writing a 1 to this item will make ACM hang up if utilizing a modem for communications. |
Serial, TCP/IP and TCP/IP SSL Connection Items
| Item Name | Data Type | Description |
|---|
| COMM_SYSTEMERROR | I4 | Indicates if the system is in error. |
| ConnectState | I2 | Displays the current state of the channel. Read Only. |
| CurrentHost | I2 | Indicates the current Host Address that is in use by the port. A value of 1 means the port is using Host Address 1 for polling. A value of 2 means the port is using Host Address 2 for polling. |
| CurrentUser | String | Displays the name of the device that is currently communicating on the port. Read Only. |
| Hangup | Bool | Writing a 1 to this item will make ACM hang up if utilizing a modem for communications. |
TCP Listen Connection Items
| Item Name | Data Type | Description |
|---|
| LogState | BOOL | Logs port state information. |
TCP Pool Connection Items
| Item Name | Data Type | Description |
|---|
| COMM_SYSTEMERROR/n | I4 | This item contains the Win32 API system error code for the last error that occurred during communication to this device. n is to be replaced with the port number 1-16. Example: Comm_SystemError /1. |
| ConnectState/n | I2 | Displays the connection status of the connection. n is to be replaced with the port number 1-16. Example: ConnectState /1. |
| CurrentUser/n | String | This item will hold the name of the device currently communicating on the port. n is to be replaced with the port number 1-16. Example: CurrentUser /1. |
| Hangup/n | Bool | Hangs up the connection. n is to be replaced with the port number 1-16. Example: Hangup /1. |
| ModemHealth/n | Bool | This item is True if the modem is responding to the initialization string. n is to be replaced with the port number 1-16. Example: ModemHealth /1. |
UDP BSAP Connection Items
| Item Name | Data Type | Description |
|---|
| COMM_SYSTEMERROR | I4 | Indicates if the system is in error. |
| ConnectState | I2 | Displays the current state of the channel. Read Only. |
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