Chapter 2 Specifications
2 – 7
2.3.3 Serial port specifications
(1) RS-232C
[1]SG
[4]ER2
[5]SD
[6]RD
[7]DR1
[8]RS
[2]CD
[3]ER1
Microprocessor
[1]
[2]
[3]
[4]
[5]
[6]
[7]
[8]
Port from a front view of module
Figure 2.1 Circuit diagram and Pin No. of RS-232C
Table 2.6 List of signal of RS-232C
Direction
Pin
No.
Signal
name
CPU Host
Meaning
1 SG Signal ground
2 CD Carrier Detect signal.
3 ER1 When CPU is ready to communicate, this signal is high.
4 ER2 Always high
5 SD Sending data from CPU
6 RD Receiving data to CPU
7 DR When this signal is high, connected device is ready to communicate.
8 RS When CPU is ready to receive data, this signal is high.
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