Solartron 1250 - Address Switches; Input Command Terminator Character Switches; Talk Only Switch; GPIB Switch Example

The RS423 and GPIB Ports. Remote Control 1250 Frequency Response Analyzer
13-6 AMK/1250/4
13.5.1 ADDRESS SWITCHES
Two GPIB ports are provided, one for ASCII commands and data, and the other for high
speed binary (DUMP) output. This eliminates many of the problems that can occur
when ASCII and binary information are mixed. The same connector pins are used but
two different software addresses are assigned.
The address of the ASCII input/output port is set up on the five address switches and is
called the MAJOR address. It must always be an even number, so the left-hand " 1 "
switch should always be in the up position for "off". The address immediately following
a MAJOR address is, of course, always on odd number, and is called the MINOR
address. It is automatically assigned to the binary port, which is for data output only.
Example: if the MAJOR address is chosen to be 16, the MINOR address will
automatically be 17.
13.5.2 INPUT COMMAND TERMINATOR CHARACTER SWITCHES
Switches F1 and F2 select the Terminating Character for the GPIB Input Commands to
the 1250 as follows:
F1 F2 Meaning
0 0 = LF (Line Feed)
1 0 = CR (Carriage Return)
0 1 =; (Semicolon)
1 1 = EOI (End Or Identify)
Any Command Terminator other than the one selected will be ignored by the Interface.
The choice of Command Terminator is usually determined by the type of Controller
used, and should be defined in the relevant Controller handbook.
EOI is the title of one of the five GPIB Management Lines. Some Controllers
automatically assert EOI accompanied by a Command Terminator. In this case, set the
1250 switches to EOI and if the Controller also offers a choice of Command Terminator,
set this to CR, LF or semicolon, to prevent the possibility of Command Data being lost
or corrupted.
13.5.3 TALK ONLY SWITCH
The 1250 GPIB Interface is put into Talk Only mode when the Talk Only switch is in the
down (ON) position. The Talk Only mode is used for GPIB plotting (described in
Section 13.16) and outputting data to a GPIB printer (described in Section 13.12.2).
13.5.4 GPIB SWITCH EXAMPLE
If the switches are set to 00110010 (read from left to right as viewed from the rear of the
1250):
The MAJOR address is 12
The MINOR address is therefore 13
The Command Terminator is semicolon
The GPIB mode is normal Talker/Listener.