18
RS-232 ↔ CURRENT LOOP INTERFACE CONVERTER
5.1 The RS-232C Interface Pinout
Pin Circuit Description Direction
1 AA Protective Ground ---
2 BA Transmit Data To DCE
3 BB Receive Data From DCE
4 CA Request to Send To DCE
5 CB Clear to Send From DCE
6 CC Data Set Ready From DCE
7 AB Signal Ground ---
20 CD Data Terminal Ready To DCE
5. The RS-232C Interface
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
SECONDARY TRANSMITTED DATA
DCE TRANSMITTER SIGNAL ELEMENT TIMING
SECONDARY RECEIVED DATA
RECEIVER SIGNAL ELEMENT TIMING
SECONDARY REQUEST TO SEND
DATA TERMINAL READY
SIGNAL QUALITY DETECTOR
RING INDICATOR
DATA SIGNAL RATE SELECTOR
DTE TRANSMITTER SIGNAL ELEMENT TIMING
PROTECTIVE GROUND
TRANSMITTED DATA
RECEIVED DATA
REQUEST TO SEND
CLEAR TO SEND
DATA SET READY
SIGNAL GROUND / COMMON RETURN
RECEIVED LINE SIGNAL DETECTOR
+ VOLTAGE
- VOLTAGE
SECONDARY RECEIVED LINE SIGNAL INDICATOR
SECONDARY CLEAR TO SEND
SIGNAL
DESTINATION
PIN
NUMBER
PIN
NUMBER
SIGNAL
DESTINATION
RS-232 Interface (Female)
Figure 5-1. The RS-232C Interface.
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