Lake Shore Model 218 Temperature Monitor User’s Manual
6-2
Remote Operation
6.1.1 IEEE-488 Interface Settings
If using the IEEE-488 interface, you must set the IEEE Address and Terminators. Press the
Interface
key. The first screen selects Serial Interface Baud Rate, and therefore is skipped by pressing the
Enter
key. The Address screen is then displayed.
Press the
s
or
t
keys to increment or decrement the IEEE Address to the desired number. Press
Enter
to accept new number or
Escape
to retain the existing number. Pressing
Enter
displays the
Terminators screen.
Press the
s
or
t
keys to cycle through the following Terminator choices: CR/LF, LF/CR, LF, and
EOI. To accept changes or the currently displayed setting, push
Enter
. To cancel changes, push
Escape
. Power down the Model 218 then back up again to allow other devices on the IEEE-488 bus
to recognize a new Address or Terminator setting.
6.1.2 IEEE-488 Command Structure
The Model 218 supports several command types. These commands are divided into three groups.
1.
Bus Control
– refer to Paragraph 6.1.2.1.
a.
Universal
(1) Uniline
(2) Multiline
b.
Addressed Bus Control
2.
Common
– refer to Paragraph 6.1.2.2.
3.
Interface
and
Device Specific
– refer to Paragraph 6.1.2.3.
6.1.2.1
Bus Control Commands
A Universal Command addresses all devices on the bus. Universal Commands include Uniline and
Multiline Commands. A Uniline Command (Message) asserts only a single signal line. The Model
218 recognizes two of these messages from the BUS CONTROLLER:
Remote (REN)
and
Interface Clear (IFC)
. The Model 218 sends one Uniline Command:
Service Request (SRQ)
.
REN (Remote)
– Puts the Model 218 into remote mode.
IFC (Interface Clear)
– Stops current operation on the bus.
SRQ (Service Request)
– Tells the bus controller that the Model 218 needs interface service.
A Multiline Command asserts a group of signal lines. All devices equipped to implement such
commands do so simultaneously upon command transmission. These commands transmit with the
Attention (ATN) line asserted low. The Model 218 recognizes two Multiline commands:
LLO (Local Lockout
) – Prevents the use of instrument front panel controls.
DCL (Device Clear)
– Clears Model 218 interface activity and puts it into a bus idle state.
