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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
1
2
3
4
5
6
7
8
9
The RS232 master port connects to the keyboard PIT RS232 master port. As both ports
have "master" pin-outs, it is necessary to swap the TXD and RXD lines.
It is only necessary to connect pins 2,3 and 5 as follows:
Intercom CPU PIT Pin
Number
2
3
5
Rev. 1
RS422 Receive data [-] (from BossWare master RS422 Tx[-])
RS422 Receive data [+] (from BossWare master RS422 Tx[+])
RS422 Transmit data [+] (to BossWare master RS422 Rx[+])
RS422 Transmit data [-] (to BossWare master RS422 Rx[-])
RS422 Communications common
Power Supply +
N/C
N/C
Power Supply Common
Pin Number
1
Internally connected to pins 4 and 6
TXD (data to slave device RXD)
2
RXD (data from slave device TXD)
3
4
Internally connected to pins 1 and 6
5
GND
Internally connected to pins 4 and 6
6
CTS (from slave device RTS)
7
8
RTS (to slave device CTS)
9
N/C
Keyboard PIT Pin Number
3
2
5
Pin Function
Pin Function
Intercom CPU PIT Pin
Function
TXD
RXD
GND
3
Keyboard PIT Pin Function
RXD
TXD
GND
900.0405
23-June-05
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