Connection Items
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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