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Terminators
HP 8112As with the new firmware (starting with serial number
2851G07381 ) work correctly with the terminators listed on page
Note
Possible Problem with
SPOLL
6-20
Programming
3. Devices with older firmware will hang up when receiving both
CR/LF and EOI. Therefore termination with both CR/LF and EOI
should be avoided when programming devices with old firmware.
Since some controllers cannot (easily) be configured so that they do
not to use CR/LF and EOI
as
terminator, the EOI line of some older
devices is disconnected.
Users of some non-HP versions of BASIC may experience difficulty in
terminating with CRLF alone, i.e. EOI cannot easily be turned off.
If
this is the case, a jumper setting inside the instrument allows EOI
line to be ignored. To set this jumper proceed as follows:
•
Remove rear feet and top cover
•
Transfer jumper A3W3 at the center of the microprocessor board
A3 from the factory setting
EOI
to position
3.
The HP 81 12A (with old and new firmware) does not pull the EOI
line. The device terminates all messages with CR/LF and a space
character.
If
the HP 81 12A is the only instrument on the bus, the SPOLL
statement may cause the instrument to "hang up" .
Either of the following will clear the fault:
1 . Use an HP-IB cable of not less than 2m length. Or:
2. Use a user-defined function to interrogate the status byte instead
of the usual SPOLL statement .
In the following program, line 20 causes a syntax error so that a
SRQ is generated. Lines 40 to 130 show how the status byte can be
interrogated with a user-defined function:
10
A=712
20 OUTPUT A ; " XYZ"
30
WAIT . 05
40
PRINT "Status byte : " , FNSpoll (A)
50 END
60 DEF FNSpoll (A)
70
S_code=A DIV 100
80
H_addr=A MOD 100
90
SEND S_code ; UNL MLA TALK H_addr CMD
100 ENTER S_code USING " # , B " ; Stb
1 10 SEND S_code ; CMD 25 UNT
120 RETURN Stb
130 FNEND
24
Summary of Contents for 8112A
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Page 92: ......
Page 144: ...8 32 Testing Performance ...
Page 176: ......
Page 190: ......
Page 194: ...10 2 4 Servicing the Power Supply ...
Page 196: ......
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Page 216: ......
Page 240: ...10 4 16 Servicing the Shaper and Output Amplifier ...
Page 242: ...A R l BD RY MR I N 1 2 7 I I IJt 51 CR1 B e i 1 _ _ _ _ 20 ...
Page 244: ......
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Page 262: ...A B A2 ED RY CONTROL ...
Page 270: ......
Page 290: ...R B c R3 BD RY M I CROPROCESSOR 1 2 3 FIGURE 1 0 7 8 ...
Page 294: ... 8 X2l 2 X2 Figure A 1 Mechanical Parts 1 A 2 Replaceable Parts ...
Page 295: ...MP MP3 MP MP2 MP4 MPS MP 1 2 MPS MP MP I B ElElElEl Replaceable Parts A 3 ...
Page 334: ......
Page 378: ...Figure B 14 Mechanical Parts 1 B 44 Backdating ...
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