Chapter 4 Rs232 Pinouts And Port Cabling; Introduction; The Rs232 Standard - Brainboxes CC-662 Hardware Manual

PCI Photon 8 Port RS232
RS232 PINOUTS AND PORT

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, how to make a selftest loop back
connector and the pinouts of the Photon 8 Port RS232 cards.

The RS232 Standard.

The RS232 standard is ancient in computer industry terms.
Introduced in 1962, it is now widely established. RS232 is a slow
photon, 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.
Figure 4-1. RS232 Point To Point Connection.
TTL
Ground
Line Length
50 Feet = 15m
CHAPTER 4
CABLING
D
RS232C Standard
1 Driver 1 Receiver
.
R TTL
Ground
Max Data Rate
20 Kbits/sec
Chapter 4 Page 39
Index