53
System Configurations
To set up the baud rate:
Step 1
Press the [Meas] or [Setup] key and then press [SYSTEM] TO enter <SYSTEM CONFIG> page
Step 2
Use the cursor key to select [BAUD] field
Step 3
Use the soft keys to select.
Soft key
Function
1200
Use this baud rate if you are using a communication converter with
optocoupler isolation.
9600
38400
57600
115200
Recommend, system default.
6.1.7
Communication Protocol Settings [PROTOCOL]
The instrument supports two communication protocols: SCPI and Modbus (RTU).
SCPI: Standard instrument communication protocol, ASCII transmission, suitable for host
computers, advanced equipment such as computer and industrial computer.
MODUBS: Industrial field bus protocol, binary transmission, suitable for host PLC and touch
screen devices.
To set up the communication protocol:
Step 1
Press the [Meas] or [Setup] key and then press [SYSTEM] TO enter <SYSTEM CONFIG> page
Step 2
Use the cursor key to select [PROTOCOL] field
Step 3
Use the soft keys to select.
Soft key
Function
SCPI
ASCII transmission
MODBUS
RTU, Binary transmission
6.1.8
SCPI [TERMINATOR] Setting
The AT381x supports multiple terminators: LF
（
ASCII
：
0x0A
），
CR
（
ASCII
：
0x0D
）
,CR+LF(ASCII:
0x0D 0x0A)
。
The host data received by the instrument may not use the terminator, and the data sent by the
instrument to the host will always end with the specified terminator.
NOTE
The instrument allows the host to send instructions without a terminator, but it is
recommended to add a terminator at the end of the command. Otherwise, it will cause a
timeout wait after each command is received (the command timeout is 10ms~50ms
depending on the baud rate).
This setting is valid only under the SCPI protocol.
To set up the terminator:
Step 1
Press the [Meas] or [Setup] key and then press [SYSTEM] TO enter <SYSTEM CONFIG> page
Step 2
Use the cursor key to select [Terminator] field
Step 3
Use the soft keys to select.
Soft key
Function
LF
ASCII: 0x0A
CR
ASCII: 0x0D
CR+LF
ASCII: 0x0D 0x0A