Gould 4070 - GPIB;RS423 Commands

Operation
6.
7.
Take note of how the cable enters the board and then
remove it
by using the pull-tab. This cable is the con-
nector to the GPIB interface.
Remove the 1/0 board taking care not to damage the
GPIB cable on the rear
of the board.
Carefully examine the 1/0 board. In the bottom left-
hand comer you will notice a group of 18 pins with
jumpers.
There are six groups of connections, a to f. On each group
it
is possible to have the jumper on either the up or the down
position.
Work out the connections you require at the rear panel,
consult the table below and move
th: jumpers accordingly.
Table 1.7.4 110 Connections
Group
Position
Description
a
up
Pin2isRX
down Pin3isRX
b up
Pin3isl,~
down Pin2isTA
c
up
Pin5isRTS
down
Pin4isRTS
d
up
Pin4isCTS
down Pin5isCTS
e up
Pin6isTrue
down Pin 20 is True
f
up
DCD is True, Pin 8 is True
down Pin8isDCD
~Uj
_dces UC
I
C87
~
--c:J- Ji
~
u
~
. . . . .
F
U28
Kl
fedcba
Figure 1.7.2 RS423 Jumpers as Supplied from
the Factory.
22
Section 1
Replacing the 1/0 board is the reverse of removal. In doing
so take care not to damage the
GPIB cable when inserting
the board and remember to press the plug fully home in the
1/0 board.
In addition to the connections it
is possible to set the baud
rate, the parity, handshake and echo and prompt. These
can all be set through the menu described
in Section 2.8.
The instrument is supplied with the following set-up: 9600
baud; eight bits; no parity; and two stop bits. Once changed
through the menu system the new setting will be the power-
on default set-up.
1.8 COMMUNICATION VIA GPIB/RS423
The GPIB and RS423 interfaces are options. Either the
GPIB or RS423 communication ports may be used to link
the
4070 series instruments with a host computer. Although
the two ports are electrically different, the communication
format is essentially the same in either case. There are cer-
tain differences
in the method of terminating a message or
data block transmitted, owing to the fact that the parallel
GPIB port has a dedicated signal line associated with flag-
ging the end of a data transfer. The difference
in this respect
are described
in 'Blocks' below. Apart from the introduc-
tory paragraphs below, the following section is equally
applicable both to GPIB and RS423 operation.
GPIB (IEEE-488)
This is a versatile parallel bus interface allowing fast com-
munication between a host computer and up to
30 peripher-
als.
It is based on a controller/talker/listener structure
whereby the host computer (usually the controller) com-
mands various peripherals to 'talk'
or 'listen' according to
the desired path of data flow. An addressing scheme per-
mits each peripheral to be referred
to uniquely. Users
unfamiliar with GPIB may wish to refer to Appendix 1.
There are three main modes available when using GPIB:
Local The operator has full control of the instrument via the
front panel. The
4070 may be il'terrogated but not
manipulated
in any way by the host computer.
Remote All of the 4070 GPIB commands can be used when
in this mode. The only front panel button still opera-
tive is the Abort button, which returns the instrument
to local mode.
Local Lock Out This is an extension to remote mode. When
the instrument
is placed in this state the operator has
no control from the front panel.
GPIB and RS423 Command Syntax
The commands of the 4070 are simple and English-like.
Where necessary, mnemonics have been used to replace
large words or text. To enable the user to send more reada-
ble commands, spaces may be inserted freely within the
commands. All spaces will be ignored except with the TXT
command.