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CHAPTER6 FUNCTIONS
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6.23 Serial Communication Function
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(2) Specifications
(a) Transmission specifications
Table6.37 shows the transmission specifications of RS-232 for the serial communication function of the CPU
module.
Check that the specifications of the personal computer and HMI match those of Table6.37 before using the
function.
*1: Can be set in the PLC parameter dialog box.
*2: Table6.38 shows the relationship between the MC protocol formats and frames.
: Available, : Unavailable
Table6.37 Transmission specifications of the serial communication function
Item Default Setting range
Communication method Full-duplex communication -
Synchronization method
Asynchronous method
-
Transmission speed
*1
19.2kbps 9.6kbps, 19.2kbps, 38.4kbps, 57.6kbps, 115.2kbps
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 Checked/not checked
Transmission wait time
*1
No waiting time
No waiting time, 10ms to 150ms (in increments of
10ms)
RUN write setting
*1
Prohibited (deselected) Permit (checked), prohibited (deselected)
Overall cable distance 15m -
Table6.38 Relationship between the MC protocol formats and frames
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