Add PS300 documentation

doc/specific_iocs/power_supplies/PS300.md

@@ -0,0 +1,19 @@
+# Stanford PS300
+
+The Stanford PS300 series is a range of high-voltage power supplies with specific models like PS310, PS325, PS350.
+Each model has a different voltage and current range, some are also dual polarity.
+The unit are remotely controllable by means of a GPIB interface, some models also have an RS-232 port.
+We use a [Prologix GPIB](/tools/Prologix-GPIB.md) GPIB -> ethernet adapter for GPIB control, which is supported by EPICS asyn. 
+
+### Setting up the Device
+
+The IOC works with a MOXA connected to the RS-232 port or Prologix GPIB -> ethernet.
+If the device is dual polarity, this can be changed via a dial at the rear of the unit.
+
+For RS232 control set the `PORT` macro to the moxa com port
+
+For GPIB set the `IPADDR` macro to the address of the Prologix GPIB adapter, and set the `GPIBADDR` macro to the GPIB address.
+This address will normally be 14, but check the menus on the device if you cannot connect.
+
+You also need to choose the correct model number for the `MODEL` macro, with a `pos` or `neg` suffix for a dual polarity device. 
+The model name is a prefix to DB substitution files listed in https://github.com/ISISComputingGroup/EPICS-SRS_PS300/tree/main/ps300Sup

doc/spelling_wordlist.txt

@@ -682,6 +682,7 @@ procservcontrol
 procserver
 profiler
 programmatically
+Prologix
 proto
 protobuffers
 pseudocode

doc/tools/Prologix-GPIB.md

@@ -0,0 +1,13 @@
+## Prologix GPIB Adapter
+
+The [Prologix GPIB-ETHERNET adapter](https://prologix.biz/) is a GPIB -> ethernet adapter that is supported by EPICS asyn via the `prologixGPIBConfigure` command 
+and is used by some of our Aeroflex and PS300 series devices.
+
+The device support DHCP but it may not work across a network gateway, so when testing best be on the same network as the adapter. The MAC address is written on the adapter.
+
+See `<Experiment Controls share>\prologix_gpib` for a manual and also the `netfinder` and `prologix configurator` programs if you need them.
+You can run `netfinder` on the same network as the adapter to find its IP address and/or change it to DHCP.
+The `prologix configurator` program lets you change other settings on the device, but is generally not needed by us as
+the main ones are set by asyn when it connects. See the [adapter FAQs](https://prologix.biz/resources/frequently-asked-questions/gpib-ethernet-controller-faq/) for more details.
+
+![](prologix_gpib.jpg)