Nope If you power off - the PAB does not work any longer.So today I updated one of my P4 systems to the beta release V1132. I thought I would document my experience.
First let me explain that I have a fish room and all my GHL equipment is up on shelves. High enough that I need to use a ladder to reach them.
I did the backup as recommended and followed Ditto's procedure listed on page 1 of this thread. I did the 7.24 update of the P4 and that seemed to work. There was a data error that popped up on the P4 display but it disappeared quickly but I think it was related to my system configuration, because the next statement said something about factory defaults or something to that affect. The system seemed to be working and I was able to reassign the PAB devices and then load my saved data.
As I indicated earlier that my GHL equipment is located up on shelves, I keep a long USB (20') and a long cat 5e cable (10') just for doing updates.
Expansion Box2: I disconnected everything except my EB2 and it was at version 2.03 and I saw that the latest was version 2.07. I didn't have any issue updating the EB2. I thought this is great. Now I needed to update my Doser 2.1 and Maxi Doser.
Doser 2.1 and Maxi Doser: Both pump units were at version 1.34. The latest in the firmware list was 1.36. So again, I disconnected everything except the Doser 2.1. I ran the firmware update process and during the erasing flash message I got an error message that it failed. I restarted the GCC software and rebooted the Doser 2.1 and the same error. This time I restarted the GCC software and rebooted the P4 and the Doser 2.1 same error. So I tried the Maxi Doser, same error. I tried rebooting the GCC software and rebooting both the P4 and Maxi, same error.
So I sent a message to Ditto. While I was waiting to hear back from him I went through this thread again. I saw Lasse had an issue updating his EB2 and he fixed it by updating to an earlier version of the firmware and then was able to update to the latest version. So I thought why not give that a try. I had noticed that there was a version 1.35 in the firmware list for the pumps. I tried that on the Doser 2.1 success. So then I tried installing 1.36 success. I did the same for the Maxi and it worked also.
Feedback for GHL. In a lab where it is easy to disconnect cables, then connect one device to the P4 and updating that one device is most likely easy. I have to climb up and down a ladder to disconnect cables, reconnect cables, power devices on and off, etc. In moving the KHD and Doser 2.1 pump to get to the PAB connections, the reagent bottle almost fell on the floor. Moving equipment around to get to the cables is not an easy task. So in the lab where it may take 5-10 minutes to do an update in the real world I spent 2-3 hours doing this update. I have another P4 setup I need to update. I had enough for one day updating one system. It shouldn't be this difficult. The other P4 system will wait for another day.
A question I have is that if I power off a device, does the PAB connections on that device act as a pass through? Now that would make this update process easier, I wouldn't need to disconnect just power off devices.