115
Programless Communications Section 5-1
2. Make the PLC settings.
Use the GX Developer to make the settings outlined below for the commu-
nications port used.
Note (1) To set a different baud rate from that given above, refer to Baud Rate Set-
ting on page 122 and change 0B.
(2) Refer to MELSEC-QnAS Series on page 123 if using a Communications
Module for the QnAS Series.
3. Make the EJ1 settings.
When using RS-232C, turn ON pin 8 on SW 2 (to select RS-232C) and
make the settings shown in the following table. No other settings are re-
quired.
For the default settings, data registers in the PLC are allocated to the EJ1
monitor and set values as shown in the following table. If the allocated words
shown below are already in use, change the words referring to Programless
Communications Upload/Download Data Area (Variable Type: F0/B0) on
page 120 and to Programless Communications Upload/Download Start
Address (Variable Type: F0/B0) on page 120.
Channel Switch
number.
Bit Description Set
value
Position Setting
CH1 SW01 b0 OFF Transmission
setting
Operation setting Independent 0BEEH
b1 ON Data bits 8
b2 ON Parity bit Yes
b3 ON Even/odd parity Even
b4
OFF
Stop bits
1
b5 ON Checksum Yes
b6 ON Write during RUN Allowed
b7 ON Setting modifica-
tions
Allowed
b8 to b15 --- Communications
rate setting
115200 bps (0BH)
SW02 --- Communications protocol setting MC protocol format 5 0005H
CH2 SW03 Same settings as SW01.
SW04 Same settings as SW02.
Common
for both
CH1 and
CH2
SW05 --- Station number setting 0 0000H
Variable type Parameter name Setting/Monitor values
F0/B0 Programless Communications Protocol
(Common)
5:MC protocol (format 5)
1:1 ms
Port C Send Wait Time (Common)
Data register Contents (monitor value) Data register Contents (set value)
D0 Read Response Bits D500 Read Request Bits
D1 Setting Change Response Bits D501 Setting Change Request Bits
D2 Operation Command Response Bits D502 Operation Command Request
Bits
D3 Communications Status D503 Operation Command Code
D4 Monitor Value A D504 Set Value A
D5 Monitor Value B D505 Set Value B
···
···
···
···
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