The CTD online transputer code is controlled by run-control software running on the CTD equipment computer. Specially designed harness software has been written to download, boot, and control the CTD occam code [5]. Besides these functions, the harness software provides a number of utilities and servers: node server, file server, ADAMO server, etc.. The SLT makes use of this code by linking with the harness library and running, in parallel with the trigger code, a node server process on each transputer. In addition, at least one bi-directional link on each node is dedicated to running the harness channel protocol. As such, any node in the trigger network can communicate with any other node in the CTD online system. Figure 1 shows the tree structure of the SLT harness network. Those links shown have the harness channel protocol running on them.
Figure 1: CTD-SLT Harness Network.