Real Time Output - Keithley 194 Instruction Manual

OPERATION
Figure 3-16. Synchronizing Five Units by Daisy Chaining
3.20 REAL TIME OUTPUT
Each A/D module has a real time output port that can
transmit A/D data to an external device such as a computer
on a real time basis.
Data can be taken a byte at a time (8 bits) or a word at a
time (16 bits). The transmission rate will, of course, de-
pend on the selected sampling rate. For example, if you
program a 1OOkHz sampling rate, transmission will occur
at that frequency.
3.20.1 Signal Lines
The pin out diagram for the real time connector is shown
in Figure 3-17. Signal lines are listed in Table 3-16. Figure
3.18 shows a typical timing diagram for the real time
output
Figure 3-17. Real Time Output Connector
Table 3-16. Real Time Output Signals
Pin Number
Signal Line
1 Digital Common
2
MEASURING
3
OVERRUN
4
NEW CONVERSION
5 HIGH BYTE
6
D8
7 D9
8
DlO
9 Dll
10 D12
11 Dl3
12
D14
13
Dl5
14 Not Used
15
Not Used
16
Not Used
17 LOW BYTE
18 DO
19 Dl
20 D2
21 D3
22
D4
23 D5
24
D6
25
D7
3-38