This evening I added a second ADC module to the prototype Acromag chassis. This chassis can now read out all the PSL diagnostic channels.
I configured the second ADC identically to the first ("ADC0"), and assigned it IP address 192.168.113.122. I confirmed it is visible on the martian network.
There was an existing but unused DB-15 feedthrough which I used for ADC1 channels 1-7. The eighth channel I left unwired, but there are slots available in the neighboring DB-25 feedthough, if that channel is needed in the future. The channel wiring assignments are as follows.
| ADC1 Channel |
DB-15 Feedthrough Pin |
| 0+ |
1 |
| 0- |
9 |
| 1+ |
2 |
| 1- |
10 |
| 2+ |
3 |
| 2- |
11 |
| 3+ |
4 |
| 3- |
12 |
| 4+ |
5 |
| 4- |
13 |
| 5+ |
6 |
| 5- |
14 |
| 6+ |
7 |
| 6- |
15 |
| 7+ |
not connected |
| 7- |
not connected |
I tested all seven of these channels by applying a calibrated voltage source and measuring the response via the Windows Acromag software. All work and are correctly calibrated to better than 0.1%. |