OG_MU-4-434_v10e Circuit Design, Inc.
47
OPERATION GUIDE
5.4.2.17 @SN Show serial number
Shows the serial number of the MU-4. The serial number is the 9-digit control number shown on the label of the
main unit. The response from the MU-4 is in ASCII characters.
Example:
Control command: @SN
C
R
L
F
Control response: *SN = A12345678
C
R
L
F
5.4.2.18 @SR Reset
Returns the MU-4 to the status when the power is turned on. The MU-4 starts up with the fixed content of the
EEPROM with the ‘/W’ option. The command response for the ‘SR’ command is issued immediately after the
command is received. The time during which commands cannot to be received is 120 ms when the ‘@SR’
command is issued and 100 ms when the hardware is reset at the INI terminal.
Example:
Control command: @
SR
C
R
L
F
Control response:
When RM = CD *SR = 00
C
R
L
F
(When RM = TX *
SR
=
00
: Software reset was performed.
C
R
L
F
)
5.4.2.19 @SY Standby mode setting
Sets the MU-4 to the standby mode. The setting information set until immediately before switching to the standby
mode is retained as it is and is still effective after returning to the normal mode.
After issuing the standby command, set the RXD, CTS, MODE, INI, and RESET terminals to High level.
Once switched to the standby mode, the TXD, RTS, RX-MON, TX-LED, RX-LED terminals are set to High level.
To return from the standby mode to the normal mode, set the CTS signal line (RTS signal line on the control side)
from High level to Low level.
Value: Standby mode = 01
Consumption current
Recovery time
State
Standby mode
4 mA (at 3 V power supply)
4.2 mA (at 4 V power supply)
5.4 mA (at 5 V power supply)
50 ms
CPU stops.
(The CLOCK stops and
starts from the next
address when returning
to the normal mode.)
Example: Control command:
@SY
01
C
R
L
F
Control response: No control response
* When disconnecting the power line of the MU-4 itself for more power saving, please make the port high
impedance to prevent current from flowing from the port connected to the CPU.
5.4.2.20 @TB Time without input in the binary mode setting
In the binary mode, if the status where no UART data is input continues beyond the set time, transmission of data
in the buffer starts automatically.
Calculate the setting value with 32 ms per 1 count.
Default: 10h (16 × 32 = 0.512 s)
Value: 01h to FFh: 1 count = 32 ms
Example: Set the time to 20h (1.02 s)
Control command:
@TB
20
C
R
L
F
Control response:
*
TB
=
20
C
R
L
F
