Rs-232 Ports; Hp Parallel Connector Pinouts - HP 743 Service Handbook

Functional Description
Built-in Interfaces
Table 2-8 shows the connector pinouts for the HP parallel connector.
Table 2-8
Pin
Signal
Number
1 NSTROBE
2 Data 0
3 Data 1
4 Data 2
5 Data 4
6 Data 4
7 Data 5
8 Data 6
9 Data 7

RS-232 Ports

There are two RS-232-C serial interfaces. This standard interface is based on a 9-pin D-
sub connector and supports CTS/RTS hardware handshaking. This port is based on the
National 16550 serial interface chip. Serial Port B is not functional until VME Services
software is loaded and operating.
The serial ports use a high density connector. An HP A4301A conversion cable is required
to convert it to a standard PC compatible, 9 pin male D-sub. The maximum baud rate
listed is the hardware limit. Actual transfer rates depend upon the operating system and
application load. Table 2-9 shows the RS-232-C Specifications.
Table 2-9
Type:
Baud Rate:
Word size:
2-14

HP Parallel Connector Pinouts

Pin
Number
10 NACK
11 BUSY
12 PE
13 SLCT
14 NAFD
15 NERROR
16 NINIT
17 NSCT IN
18 GND
RS-232-C Specifications
EIA RS-232-C, CCITT V.24/V.28
50 to 460.8 Kbits
5 to 8 bits
Pin
Number
19 GND
20 GND
21 GND
22 GNDGND
23 GND
24 GND
25 GND