DEC VT420 - VT420 North American Model

64 Physical/Functional Diagrams
GSF_1466_89.DG
LK401
R647 SUB
CONTRAST
R619 V-SIZE
R611 V-LIN
R615 H-HOLD
R657 SCREEN
R656 STATIC
D304
J601
J2
J1
Printer
Comm1
P7-BLUE
J801
P3-BROWN
P4-BLACK
P1-GREEN
BRNH1
J701
YELK
GRNG1
PS
P701
P6-RED
DEC-423
DEC-423
AC IN
BLEG4
J3
REDG2
FOCUS
Comm2/
Figure C–1 VT420 North American Model
VT420 North American Model: Signals and Pin Assignments
Terminal Board Assembly
J1 DEC-423 Comm1 Port Connector
Pin 1 HDTR2 Data terminal ready
2 HTXD2 Transmitted data
3 GND Transmit ground
4 HCOM Receive ground
5 RXD2 Received data