Tenma 72-6851 & 72-6853 Instruction manual
the addresses 1-26 inclusive while @ is address 0 and so on. Once addressed to listen the
instrument will read and act upon any commands sent until the listen mode is cancelled.
Because of the asynchronous nature of the interface it is necessary for the controller to be
informed that an instrument has accepted the listen address sequence and is ready to receive
commands. The controller will therefore wait for Acknowledge code, 06H, before sending any
commands, The addressed instrument will provide this Acknowledge. The controller should time-
out and try again if no Acknowledge is received within 5 seconds.
Listen mode will be cancelled by any of the following interface control codes being received:
12H
Listen Address followed by an address not belonging to this instrument.
14H
Talk Address for any instrument.
03H
Universal Unaddress control code.
04H
Lock Non-Addressable mode control code.
18H
Universal Device Clear.
Before a response can be read from an instrument it must be addressed to talk by sending the
Talk Address control code,14H, followed by a single character which has the lower 5 bits
corresponding to the unique address of the required instrument, as for the listen address control
code above. Once addressed to talk the instrument will send the response message it has
available, if any, and then exit the talk addressed state. Only one response message will be sent
each time the instrument is addressed to talk.
Talk mode will be cancelled by any of the following interface control codes being received:
12H
Listen Address for any instrument.
14H
Talk Address followed by an address not belonging to this instrument.
03H
Universal Unaddress control code.
04H
Lock Non-Addressable mode control code.
18H
Universal Device Clear.
Full List of Addressable RS232 (ARC) Interface Control Codes
02H
Set Addressable Mode.
03H
Universal Unaddress control code.
04H
Lock Non-Addressable mode control code.
06H
Acknowledge that listen address received.
0AH
Line Feed (LF); used as the universal command and response terminator.
0DH
Carriage Return (CR); formatting code, otherwise ignored.
11H
Restart transmission (XON).
12H
Listen Address - must be followed by an address belonging to the required instrument.
13H
Stop transmission (XOFF).
14H
Talk Address - must be followed by an address belonging to the required instrument.
18H
Universal Device Clear.
GPIB Interface
The 24-way GPIB connector is located on the instrument rear panel.
The pin connections are as specified in IEEE Std. 488.1-1987 and the instruments in the range
comply with IEEE Std. 488.1-1987 and IEEE Std. 488.2-1987 and contain the following IEEE
488.1 subsets.
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