Mitsubishi Electronics QnUCPU

CHAPTER6 FUNCTIONS

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 bi t: 1

MC protocol format*2

(automatic detection)

•Format 4 (ASCII)

•Format 5 (binary) -

Frame*2 • QnA-compatible 3C frame

•QnA-c ompatible 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