Brainboxes 1 Port Rs232 Card, Руководство пользователя

Страница: 60 / 67

1 Port RS232 Card Chapter 8
•
57
Chapter 10
RS232 Pinouts and Cabling
Introduction.
This chapter gives details of the 9 and 25 pin RS232 pin outs, cabling and
connections, with information on how to connect the serial ports of two PCs
and how to make a selftest loop back connector.
The RS232 Standard.
The RS232 standard is ancient in computer industry terms. Introduced in 1962, it
is now widely established. RS232 is a slow speed, short distance, single ended
transmission system (i.e. only one wire per signal). Typical RS232 maximum
cable length is 50 feet with a maximum data rate of 20K bits per second.
RS232 Point To Point Connection.
D TTL
Ground Ground
TTL R
RS232C Standard
1 Driver 1 Receiver
Line Length Max Data Rate
50 Feet = 15m 20 Kbits/sec
Serial Port Pin Outs.
The pinouts of the 9 and 25 pin Male D connectors are given below.
9 Pin connector:
25 Pin connector: