ATPAD Ports

Flow Control

You can configure the ATPAD for either type of flow control:

Control Signal

XON/XOFF

If you select Control Signal, the port does not send data if the port's Pin 14 input is LOW. If the port wants to flow control the attached device, it sets its CTS output LOW.

If you configure the port for XON/XOFF, the port stops sending data if it receives the configured XOFF character. It resumes transmission when it receives an XON character. You can configure the XOFF and XON characters. If the port wants to flow control the attached device, it sends an XOFF character. Then it sends an XON character when it is ready to receive more data.

Caution!

If the port's message queue overruns because flow control is not in effect, the port discards data and this alarm is generated:

Pn - DATA DISCARDED

where: Pn - is the port identifier, and n is the port number.

Protocol Identifier You can use a Protocol Identifier to ensure that only calls from other devices using the same Protocol Identifier are accepted.

You configure a Protocol ID in the port record. The PID is inserted in the Call User Data field of all Call Request packets generated by the port. All incoming Call requests are checked for the presence of the same PID. If it is not present in the Call Request packet, the call is rejected.

If you leave the Protocol ID parameter blank, no PID is inserted in Call Requests, and there is no checking of incoming Call Request PIDs.

CUD and Facilities Call User Data (CUD) and facilities in incoming Call Request packets are ignored except for the PID. If you need to insert CUD and Facility fields in Call Request packets generated by the port, do this:

Step

Action

1Configure one of the Stored Addresses using the X.28 Call Command format.

2Insert the appropriate CUD and Facilities fields in the configured Call Command string.

3Use the ATDSn command referencing the correct Stored Address.

Configuring PAD/ATPAD Ports

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3Com S200 manual Flow Control, Xon/Xoff

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