JY997D33201C
September 2010
MITSUBISHI ELECTRIC CORPORATION
Made in Japan
Page: 1 of 2
Supplement Manual
FX
3U
-485ADP-MBH
FX
3U
-485ADP-MBH communication special adapter only differs from the FX
3U
-485ADP-MB with respect to the
following specification.
For details on installation, wiring and other specifications, refer to the following manuals.
→
FX
3U
-485ADP-MB INSTALLATION MANUAL
→
FX
3U
SERIES USER’S MANUAL - MODBUS Serial Communication Edition
→
FX SERIES USER’S MANUAL - Data Communication Edition
1. Differences between the MODBUS serial communication specifications of the
FX
3U
-485ADP-MBH and FX
3U
-485ADP-MB
2. Transmission speed (baud rate) settings for MODBUS serial communication
The communication speed (baud rate) is set in the communication format (Ch1: D8400 bit 4 to 7, Ch2: D8420 bit
4 to bit 7). Allocation of bit 4 to bit 7 in D8400 (Ch1) and D8420 (Ch2) is as follows on the next page.
→
For details on the other bits, refer to the FX
3U
SERIES USER’S MANUAL
- MODBUS Serial Communication Edition
Caution
When you set the baud rate to 38400 bps or more in a FX
3G
Series PLC, please set D8411 (D8431) to be 3ms or
more. When D8411 (D8431) is set at less than 3ms, it may not be able to communicate normally.
Item
FX
3U
-485ADP-MBH
FX
3U
-485ADP-MB
Transmission Specifications
Transmission Speed
(Baud rate)
300/600/1200/2400/4800/9600/
19200/38400/57600/115200 bps
300/600/1200/2400/
4800/9600/19200 bps
Master Specifications
Number of Slaves
64 slaves
16 slaves
Bit No.
Name
Contents
0 (bit = OFF)
1 (bit = ON)
b0
Data length
7-bit
8-bit
b1
b2
Parity
b2, b1
(0, 0): Not provided
(0, 1): Odd
(1, 1): Even
b3
Stop bit
1-bit
2-bit
