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CHAPTER 3 FUNCTIONS
3
3.23 Serial Communication Function
(1) Specifications
(a) Transmission specifications
The following is the transmission specifications of RS-232 used for this function. Check that the specifications
of the personal computer or HMI from other companies match those in the following table.
*1 The item is set in the PLC parameter of the programming tool. ( Page 455, Appendix 1.2.12)
*2 Relationship between the MC protocol formats and frames is shown below.
: Available, × : Unavailable
(b) RS-232 connector specifications
The following is the specifications of the RS-232 connector of a CPU module.
Item Setting range Default
Communication method - Full-duplex communication
Synchronization method - Asynchronous method
Transmission speed
*1
9.6kbps, 19.2kbps, 38.4kbps, 57.6kbps, 115.2kbps 19.2kbps
Data format -
• Start bit: 1
• Data bit: 8
• Parity bit: Odd
• Stop bit: 1
MC protocol format
*2
(automatic detection)
-
• Format 4 (ASCII)
• Format 5 (binary)
Frame
*2
-
• QnA-compatible 3C frame
• QnA-compatible 4C frame
Transmission control - DTR/DSR control
Sum check
*1
Checked/not checked Checked
Transmission wait time
*1
No waiting time, 10ms to 150ms (in increments of 10ms) No waiting time
RUN write setting
*1
Permit (selected), prohibited (deselected) Prohibited (deselected)
Overall cable distance - 15m
Function Format 4 Format 5
Communication in ASCII code
QnA-compatible 3C frame ×
QnA-compatible 4C frame ×
Communication in binary code QnA-compatible 4C frame ×
Appearance Pin number Signal Signal name
1 RD (RXD) Receive data
2 SD (TXD) Send data
3 SG Signal ground
4- -
5 DR (DSR) Data setting ready
6 ER (DTR) Data terminal ready
Mini-DIN 6 pins
(female)
3
2
6
4
5
1
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