The PIT which connects to the remote keyboard polls the Intercom keyboard via it’s RS422 Slave port. This PIT will be referred to as the keyboard PIT. When it detects any key press, these are converted into ASCII characters in the range ‘0’..‘7’ which are transmitted out of the RS232 master port.
2.1 CONNECTIONS 2.1.1 Intercom CPU PIT The RS422 slave port of this PIT connects pin to pin to the Intercom CPU BossWare master port. Due to the master / slave connection, pin to pin connections are required. Pin Number Pin Function...
2.1.2 Keyboard PIT The RS422 slave port of this PIT connects to the Intercom keyboard. This slave port pin- out is as described in 2.1. It is necessary to connect the TXD lines to the keyboard RXD and vice versa.
3.1 DIP SWITCH SETTINGS To access the configuration switches, the two screws on the top cover of the PIT must be removed. The legend on the cover shows the switches as S1, S2 and S3. Each of these switch groups has 8 individual switches, marked as 1 through 8. Individual switches are referred to by the switch group, followed by the switch number.
3.3 Keyboard Intercom Address Setting Note that each remote keyboard intercom must be set to address 1. The address which the system applies to this keyboard is configured on the Intercom CPU PIT. Rev. 1 900.0405 23-June-05...
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