Optional Equipment - Section 6 OM6007 2/99 Page 6-28 Payload Meter II SCOREBOARD Description The Scoreboard from Komatsu Mining Systems uses information from the Payload Meter to display the current load. It uses ultra-high-brightness LED tech- nology to form 3 digits. The sign is fully sunlight read- able and housed in a rugged steel enclosure. The Scoreboard displays each swing pass as the truck is being loaded. As the truck drives away, the sign will display the last swing pass until the final load calcula- tion is made. It will then switch to display the final load calculation and hold it until the truck dumps. The sign will then clear for the empty ride back to the shovel.
Making Connections The Scoreboard connects to the RS232 port on the Payload Meter. It must share this connection with other dispatch systems like Modular Mining as well as the PC download connection. This sharing of the single port creates special circumstances when using a Per- sonal Computer or dispatch system. Figure 6-15. Scoreboard The Scoreboard is in constant communications with the Payload Meter and must acknowledge every mes- sage from the meter. In addition, the Scoreboard must also signal the Payload Meter that it is ready to receive messages by supplying a 5vdc signal over the CTS line.
Installations that include Modular Mining or other dispatch systems must take over the responsibility for acknowledging messages from the Payload Meter. To do this, the return communications line and the CTS line from the Scoreboard must be cut and taped back. When this is done, the Scoreboard simply monitors communications between the Payload Meter and Modular Mining. The Modular Mining system acknow- ledges each message from the meter. The harness for the Scoreboard supplies two extra connections in the overhead compartment of the cab. One is for the existing PC port and the other is for Modular Mining.
When two Scoreboards are installed, the first sign transmits load information and power to the second sign. Note that the communications wire from the first sign connects to terminal 35L7. This is the retransmit terminal. This wire then connects to the 35L4 terminal in the second sign. This is the receive terminal of the second sign. The Payload Meter must be set to use OP12 . Refer to "Setting the Option Code" for instructions. Sharing this RS232 port with the Personal Computer for downloading can also create problems with com- munications. The Payload Meter can confuse mes- sages from the PersonalComputer and Scoreboard.
To eliminate this problem, the Scoreboard must be turned off during downloading of the Payload Me- ter. Using the circuit breaker to turn off the main power to the Scoreboard is the best way to accomplish this. The power to the Scoreboard must be turned off before communications between a Personal Computer and the Payload Meter can start. Once the download proc- ess is finished, the power needs to be restored to the Scoreboard to keep from receiving F99 or F93 error codes. Once in this mode, the Payload Meter will look for the Scoreboard and attempt to communicate with it. If there are communications problems, the Payload Meter may indicate a communications port error.
Refer to "Fault Codes" for additional information.