Yokogawa DR240 - Manual (Page 20)

3-1 IM DR231-11E
Overview and Specifications of RS-422-A/RS-485 Interface
3
3.1 Description of Functions (RS-422-A/RS-485)
Listener and Talker Functions
Listener Function
This allows almost all settings except power on/off and operation control.
• Settings except communication settings.
• Operation control except power on/off.
• Call-up of setting data
• Specifying of output data (specifying of channel numbers or output data types)
Talker Function
The following data can be output:
• Measured data
• Data on RAM disk
• Report data
• System configuration
• Data for operation mode setting
• Data for setup mode setting
For measured data and data on RAM disk, binary output or ASCII output can be selected. (for RS-
422-A with using the multi point.) Report data are output in binary format. Other data are output in
the form of ASCII data.
Data Output
When trigger(ESC T) becomes activated DR will store the new data in a buffer. When an output
request such as the FM command is received, these new data will be output.
Commands Applicable to RS-422-A/RS-485 Only
The following commands are only applicable to RS-422-A/RS-485.
ESC O Open Command (address a communication destination)
Setting ESC O xx<terminator>
xx : address, 01 to 31
Description Specifies the communicating device by its address. When this command is ex-
ecuted, all commands to the DR series (including ESC T) become effective.
• Only one device can be opened.
• Executing ESC O automatically closes all opened devices.
• When the DR series receives this command correctly, it sends “ESC O xx” in
response to the computer.
• CR+LF can only used for the terminator.
ESC C Close Command (close the addressed state of a device)
Setting ESC C xx<terminator>
xx : address, 01 to 31
Description Disconnects the device currently connected. When this command is executed, it
allows opening communication with other devices with the ESC O command.
• When the DR series receives this command correctly, it sends “ESC C xx” in
response to the computer.
• CR+LF can only used for the terminator.
The following commands are same as the RS-232-C interface. Refer to User’s Manual shown
below.
ESC T (Trigger Execution), ESC S (Status Output Command)
Note
• ESC corresponds to hexadecimal code (1B)H. On the N88-BASIC, “ESC x” is denoted as “CHR$(&H1B)+”x”.”