Technical data

Functional Description
Built-in Interfaces
2-14
Table 2-8 shows the connector pinouts for the HP parallel connector.
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 2-8 HP Parallel Connector Pinouts
Pin
Number
Signal
Pin
Number
Pin
Number
1 NSTROBE 10 NACK 19 GND
2 Data 0 11 BUSY 20 GND
3 Data 1 12 PE 21 GND
4 Data 2 13 SLCT 22 GNDGND
5 Data 4 14 NAFD 23 GND
6 Data 4 15 NERROR 24 GND
7 Data 5 16 NINIT 25 GND
8 Data 6 17 NSCT IN
9 Data 7 18 GND
Table 2-9 RS-232-C Specifications
Type:
EIA RS-232-C, CCITT V.24/V.28
Baud Rate:
50 to 460.8 Kbits
Word size:
5 to 8 bits