6
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6.24 Serial Communication Function
6
FUNCTIONS
(2) Specifications
(a) Transmission specifications
Table6.51 indicates the transmission specifications of RS-232 used for the serial
communication function of the CPU module.
Use the serial communication function after making sure that the specifications of
the personal computer, Display device or the like match those of Table6.51.
* 1 : Can be set in the PLC parameter setting of GX Developer.
* 2 : The relationships between the MC protocol formats and frames are indicated in Table6.52.
: Usable, : Unusable
Table6.51 Transmission specifications of serial communication function
Item
Default
Setting Range
Communication
system
Full-duplex
communication
------
Synchronization
system
Asynchronous system
------
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
judgment)
Format 4 (ASCII)
Format 5 (binary)
------
Frame
*2
QnA-compatible 3C
frame
QnA-compatible 4C
frame
------
Transmission control
DTR/DSR control
------
Sumcheck
*1
Yes
Yes, No
Transmission wait
time
*1
No wait
No wait, 10ms to 150ms (10ms increments)
Online change
setting
*1
Not enabled
Enabled, Not enabled
Extension distance
15m
------
Table6.52 Relation between 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
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