(16) ACC Mode Key/RS-232C Delimiter Adjustment/ATT Mode Switching (Option)
1. The TSL-210 can be operated in either Automatic Power Control (APC) or Automatic Cur-
rent Control (ACC) mode. When the power switch is rst turned on, the unit will be in the
APC mode. In APC mode, the optical output power can be set; this is maintained through
feedback loop that adjusts the injection current. In the ACC mode, the current is preset
and the rotary-encoder only allows tuning of the output wavelength. In the APC mode
wavelength adjustment will not result in an output power change; however, to facilitate the
output power remaining constant, the LD injection current must change, which results in
the wavelength and side mode suppression ratio also changing slightly. If it is necessary to
avoid such changes, please operate the unit under ACC mode.
2. If this key is pressed when the power is rst switched on, The RS-232C delimiter can be
varied. (Please see Section 9-2-A. Turning on/Setting RS-232C delimiter)
3. Pressing this key while the SHIFT LED is lit toggles the control mode of ATT (option)
between ON and OFF.
(17) Rotary encoder
This is used to set data of wavelength, optical output power, ne tuning and so forth. Setting of
optical output power is not available when ACC is ON.
(18) Rotary encoder wavelength / Fine tuning setting LED
This LED lighting indicates that the rotary encoder is set for wavelength tuning.
(19) Rotary encoder optical output power setting LED
This LED lighting indicates that the rotary encoder is set for optical output power tuning.
1. The rotary encoder is set for control amount in ne tuning mode.
2. Pressing this key while the SHIFT LED is lit changes minimum tunable step of wavelength
setting. (Refer to 9-4 Setting Wavelength)
(20) Rotary encoder change key/Minimum digit setting
This key switches the rotary encoder to wavelength tuning or optical output power tuning.
The currently selected parameters can be conrmed by setting LED of each parameter. Optical
output power setting by rotary encoder is not available when ACC mode is ON.
(Please refer to Section 9-3. How to use rotary encoder.)
(21) GP-IB remote LED
This LED lighting indicates the remote status by GPIB. In the remote status, other operation by
GPIB local key on the front panel cannot be accepted. The local key releases the remote status,
and key operation becomes available.
(22) GP-IB local key/GB-IB address change key
1. When in remote status by GP-IB control, pressing this key brings you back to local status,
and enables the control of the front panel.
2. Pressing this key while the SHIFT LED is lit enables changing of the GP-IB address. The
GP-IB address is displayed in the place of optical output power display. The address is
changed by the rotary encoder and pressing the key again. (Please refer to Section 10-1-D.
TSL-210 GP-IB)
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