Figure 4-2 shows the switches and connectors placed on the rear side of the system enclosure. These are:
| P1 | Power switch |
| F1 | Fuse, 1.6 A T type |
| J1 | Power test connector (15 pole D SUB female), voltage supply for Centronics interface box |
| J2 | Control cable connector (37 pole D SUB male) |
| J3 | Control cable connector (37 pole D SUB female) |
| B1 | Ground bolt |
Table 4-A: Switches and connectors on the system enclosure
J1 is the power test connector where the voltages provided by the switching power supply can be measured, connected to the pins through a 1 kOhm protective resistor. (If T3Ster is used with a Centronics interface box, voltage supply to the interface box is provided via the J1 socket. For voltage measurements the interface box needs to be temporarily unplugged from J1.) Signals from the control computer are connected to J2 and J3 through two control cables. The layout of the cables is identical, genders are alternated on the two sides in order to prevent wrong connection.
Figure 4-2: Schematic rear view of the system enclosure
|
Pin |
Signal |
Description |
|
1
|
DGNDM | Digital ground |
|
2
|
DGNDM | Digital ground |
|
3
|
AGNDM | Analogue ground |
|
4
|
AGNDM | Analogue ground |
|
5
|
-15DM | - 15V, DAC supply |
|
6
|
-15PM | - 15V, power driver modules |
|
7
|
NC | |
|
8
|
-15M | - 15V, measurement modules |
|
9
|
5VA | + 5V, digital control modules |
|
10
|
+24M | Main power supply |
|
11
|
NC | |
|
12
|
+15DM | + 15V, DAC supply |
|
13
|
+15PM | + 15V, power driver modules |
|
14
|
5VBM | + 5V, digital parts of power driver modules |
|
15
|
+15M | + 15V, measurement modules |
Table 4-B: J1 Power test connector pins
Signal 5VBM and 5VA has to be measured from DGNDM, other signals have to be measured from AGNDM.
| Pin | Source | Signal | Description | Pin | Source | Signal | Description | |
| 1 | Equipment | IRQin | IRQ in | (not used) | 20 | Computer | +5V | (not used) |
| 2 | IRQE | IRQ enable | (not used) | 21 | GDN | Signal ground | ||
| 3 | as set | B7 | data in/out | 22 | as set | C7 | data in/out | |
| 4 | as set | B6 | data in/out | 23 | as set | C6 | data in/out | |
| 5 | as set | B5 | data in/out | 24 | as set | C5 | data in/out | |
| 6 | as set | B4 | data in/out | 25 | as set | C4 | data in/out | |
| 7 | as set | B3 | data in/out | 26 | as set | C3 | data in/out | |
| 8 | as set | B2 | data in/out | 27 | as set | C2 | data in/out | |
| 9 | as set | B1 | data in/out | 28 | as set | C1 | data in/out | |
| 10 | as set | B0 | data in/out | 29 | as set | C0 | data in/out | |
| 11 | GND | Signal ground | 30 | as set | A7 | data in/out | ||
| 12 | NC | 31 | as set | A6 | data in/out | |||
| 13 | GND | Signal ground | 32 | as set | A5 | data in/out | ||
| 14 | NC | 33 | as set | A4 | data in/out | |||
| 15 | GND | Signal ground | 34 | as set | A3 | data in/out | ||
| 16 | NC | 35 | as set | A2 | data in/out | |||
| 17 | GND | Signal ground | 36 | as set | A1 | data in/out | ||
| 18 | NC | 37 | as set | A0 | data in/out | |||
| 19 | GND | Signal ground |
