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+# Documentation for Stanford Research DG645 device and ophyd class
+This device allows to create TTL pulse for hardware trigger control of stages, detectors and more.
+It can be operate on external and/or internal triggering with up to 5 signals (T0, AB, CD, EF, GH) that can be generated for single or burst triggers.
+A detailed description of all functionality can be found in the [manual](https://www.thinksrs.com/downloads/pdfs/manuals/DG645m.pdf) of the device online. 
+The DG645 is for instance used for hardware triggering for fly scans at cSAXS.
+As for all EPIC devices, you need to ensure that the EPICS IOC is running to be able to control the device.
+This readme relates to the implementation of the devices as an ophyd class done in DelayGeneratorDG645.py. 
+## Integration of device in IPython kernel
+To add the device within IPython, proceed with the following steps:
+```Python
+from ophyd_devices.epics.devices.DelayGeneratorDG645 import DelayGeneratorDG645
+ddg4 = DelayGeneratorDG645(prefix='delaygen:DG1:',name='DDG4')
+```
+with prefix and name matching the settings within the EPIC's IOC.
+## TODO Integration of device in BEC device config!
+to be tested too
+## DDG645 ophyd class wrapper
+***Control trigger source***
+```Python
+ddg4.source.set(value:int)
+# int between 0 and 6
+```
+with *int* 
+- 0: internal, 1: ext rising edge, 2: ext falling edge, 3: SS ext rise edge, 4: SS ext falling edge, 5: Single shot, 6: line
+See manual for more details, most commonly used 0,1,2. 
+***Control width and delay of for instance channel AB***
+```Python
+ddg4.channelAB.width.set(1e-3) # setpoint in s
+ddg4.channelAB.width.read()
+ddg4.channelAB.delay.set(1e-3) # setpoint in s
+```
+***Burst mode***
+ Check page 26 of manual for details.
+```Python
+ddg4.burstEnable(count:int, delay:float, period:float, config="first")
+# with
+# count: number of burst triggers on all channels: integer>0
+# delay: initial delay before first trigger in s:>0
+# period: repetition rate for triggers in s:>0, e.g. exposure time + readout time 
+# config Whether T0 fires off for all or only first trigger in burst sequence: "all" or "first"
+# for example
+ddg4.burstEnable(50, 0.015, 0.05, config="first")
+```
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