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Final Report
Pin
1
2
3
4
5
Colin K McCord
Signal
Pin
Data Carrier Detect
Receive Data
Transmit Data
Data Terminal Ready
Signal Ground
6
7
8
9
Signal
Data Set Ready
Request to Send
Clear to Send
Ring Indicator
Figure 3.6b. 9-pin RS232 D-connector, pin signal description
Typical line drivers / receivers chips for RS232 are the Maxim MAX232 or MAX233 chips (see
http://www.maxim-ic.com) the original specification states that RS232 should drive 50 feet, but modern line
driver/receivers can manage much better than this.
Baud Rate
110 bps
300 bps
1200 bps
2400 bps
4800 bps
9600 bps
Max Distance Shielded Cable
5000 feet
5000 feet
3000 feet
1000 feet
1000 feet
250 feet
Max Distance Unshielded Cable
3000 feet
3000 feet
3000 feet
500 feet
250 feet
250 feet
Figure 3.6c. Typical maximum distance modern line driver/receivers can manage before errors occur.
EEE516J4 – Honours Project
Page 15
Chapter 3: Fundamentals