13-3-C Control Method
ATT option is not designed to frequently control the attenuation level. Both manual control
and automatic control are available and these modes can be set using the external communica-
tion port.
1) Manual Control
Manual control allows the ATT number to be set using the external communication port.
2) Automatic Control
Automatic control of ATT is initially active when the unit is operated in APC mode. When
APC is in operation and the APC target value changes, if the current reaches its upper limit, the
lower attenuation level is selected. If the current becomes less than 80mA, the larger attenua-
tion level is selected. However, if for some reason the APC target value setting is not achiev-
able, the previous attenuation setting is used.
13-3-D Control Method of Use
Several setting methods are available for this option: control mode switching from front panel,
external initialization and mode switching using external control, and ATT number switching
using manual mode.
After turning the power on, initialization is performed and automatic control is set in active.
* For information on the commands for the external communication control, please refer to the
section given in parentheses.
(10-3. Communication control, List of Commands)
1) Control Mode Switching (ATE, ATD)
Toggling between manual control and automatic control is achieved using the external commu-
nication port. The LED above of LD key ashes to indicate that automatic control has been set
(LED ON = Automatic control)
* In ACC mode (LED above ACC key is lit), irrespective of indication by the ashing LED
manual control mode will always be operative.
2) Manual Control Mode (ATD, AT xx.xx, AO)
Manual control is possible using the external communication interface. Switch to manual con-
trol mode when the unit is operated in ACC mode or with external low frequency modulation.
ATT is set to 0dB if APC mode is switched to ACC mode while automatic control mode of
ATT is active. Manual control is effective only in ATT manual mode or in ACC mode.
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