WILLETT 430 - Page 76

Technical Description: Control Electronics
Issue 2
59
Part No. 306-0430-102
CON_K
(Figure 24(
1
)) is connected to the keypad.
Pin No. Signal Function Pin No. Signal Function
1 GND EMC earth connection 12 SL1 Scan line 1
2 ALT ALT key 13 SL2 Scan line 2
3 CTL Control key 14 SL3 Scan line 3
4 SFT Shift key 15 SL4 Scan line 4
5 0V Scan line 7 16 SL5 Scan line 5
6 SL7 Return line 0 17 SL6 Scan line 6
7 RL0 18 RL4 Return line 4
8 RL1 Return line 1 19 RL5 Return line 5
9 RL2 Return line 2 20 RL6 Return line 6
10 RL3 Return line 3 21 RL7 Return line 7
11 SL0 Scan line 0 22 GND EMC earth connection
Table 3 CON CPU CON_K Keypad Connector
CON_232
(
2
) is a RS232 serial communications port (COM1) and can be connected to any other device which supports
RS232.
Pin No. Signal Function Pin No. Signal Function
1 TXDA Transmit data 4 DCD Data carrier detect
2 DTR Data terminal ready 5 COM Common
3 RXDA Receive data 6 - +8V
Table 4 CPU CON_232 RS232 Serial Interface
CON_B (
3
) is an interboard connector which connects the CPU board to the I/O board.
Pin No. Signal Function Pin No. Signal Function
1 0 V Common 11 opto I/O Expansion board enable
2 Sel2 Not used 12 adc A/D converter output enable
3 ex1 Photocell 1 input 13-20 cb0 to cb7 Control bus bits 0 to 7
4 ex2 Phase detector 21-28 db0 to db7 Data bus bits 0 to 7
5 ex3 A-D end of conversion 29 qddc D/A converter output enable
6 ex4 Phase detector 30 levels Optical level sensors select
7 ex5 Photocell 2/shaft encoder
quadrature input
31 I/O PPI enable
8 sel3 Print/phase 32 sft-enc Shaft encoder input
9 strobe LED strobe 33 extra1 Traffic light enable
10 PWM Pump control (pulse width
modulation)
34 contrast LCD contrast voltage
Table 5 CPU CON_B I/O Board Interface