Specifications

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105 •• Appendices Installation & Reference Guide — DOC. 5822

PingSvr, PingSys, COM Settingss

PongSvr, PongSys

Description

Request for acknowledgement

Direction PingSvr: System to Server PongSvr: Server to System to Server

PingSys: Server to System PongSys: System

Type

Digital

Value

Pulse

Expected Reply PongSvror PongSys

Comments When the Server receives a PingSvr signal, it immediately responds with a

PongSvr signal pulse. This is useful during System installation to test

communications with the Server. A very rudimentary SIMPL program is required.

This is actually more useful for testing RS-232 connections which are not formally

opened the way TCP/IP connections are. Assuming a reliable connection has been

established, a secondary reason to ping the Server (using either communications

mode) is to test the communications protocol and Server operation in general.

For the Server to PingSys the Systems and get a PongSys in response also

requires one of the PingPong programs to be loaded into the control systems.

If you wish to keep this capability in your done SIMPL program, include explicit

programming.

One general use of the signals might be to have the Systems check for the

connection every few minutes or so by sending a Ping. If a Pong is not returned

within a certain window of time, the control system should repeat the Ping

transmission a couple of times. If still no reply, the control system should then

report an error in some way (to the front panel or to a touchpanel).