Table of Contents
Advertisement
Table 3-4. Model 175 Interface Function Codes
Code Interface Function
SHI
AMI
T5
L4
SRI
Rl_2
PRO
DC1
DTI
CO
El
TEG
LEO
Source Handshake Capability
Acceptor Handshake Capability
Talker (Basic Talker, Serial Poll, Talk Only
Mode, Unaddressed To Talk On LAG)
Listener (Basic Listener, Unaddressed To Listen
On TAG)
Service Request Capability
No Local Lockout Capability
No Parallel Poll Capability
Device Clear Capability
Device Trigger Capability
No Controller Capability
Open Collector Bus Drivers
No Extended Talker Capabilities
No Extended Listener Capabilities
Table 3-5. IEEE Command Groups
HANDSHAKE COMMAND GROUP
DAC = DATA ACCEPTED
RFD = READY FOR DATA
DAV=DATA VALID
UNIVERSAL COMMAND GROUP
ATN = ATTENTION
DCL = DEVICE CLEAR
IFC = INTERFACE CLEAR
LLO = LOCAL LOCKOUT
REN = REMOTE ENABLE
SPD = SERIAL POLL DISABLE
SPE = SERIAL POLL ENABLE
ADDRESS COMMAND GROUP
LISTEN:
LAG = LISTEN ADDRESS GROUP
MLA = MY LISTEN ADDRESS
UNL = UNLISTEN
TALK:
TAG = TALK ADDRESS GROUP
mta=my talk address
UNT=UNTALK
OTA = OTHER TALK ADDRESS
ADDRESSED COMMAND GROUP
ACG = ADDRESSED COMMAND GROUP
GET = GROUP EXECUTE TRIGGER
GTL = GO TO LOCAL
SDC = SELECTIVE DEVICE CLEAR
STATUS COMMAND GROUP
RQS = REQUEST SERVICE
SRQ = SERIAL POLL REQUEST
STB = STATUS BYTE
END = EOI
3.4 GENERAL BUS COMMAND PROGRAMMING
General bus commands are those commands which have the
same general meaning regardless of instrument configura
tion. These commands are grouped into two categories:
1. Addressed Commands. These commands require that the
primary address of the instrument agrees with the primary
address in the controller's programming language.
2. Unaddressed Commands. No primary address is required
for these commands. All devices equipment to implement
these commands will do so simultaneously when the com
mand is sent.
Table 3-6. General Bus Command
Addressing
HP-85 BASIC
Command
Required ?
Statement
REN
Yes
REMOTE 724
IFC
No
ABORTIO 7
GTL
Yes
LOCAL 724
DCL
No
CLEAR 7
SDC
Yes
CLEAR 724
GET*
Yes
TRIGGER 724
GET*
No
TRIGGER 7
*GET may be sent with or without addressing.
General bus commands are summarized in Table 3-6, which
also lists the HP-85 BASIC statement that sends each com
mand. Each addressed command statement assumes a
primary address of 24.
NOTE
The Model 175 must be set for a primary address
of 24 to work with addressed command ex
amples.
3.4.1 REN (Remote Enable)
The remote enable command is sent to the Model 175 by the
controller to set it up for remote operation. Generally, this
should be done before attempting to program the instrument
over the bus. The Model 175 will indicate that it is in the
remote mode by displaying the RMT annunciator.
To place the Model 175 in the remote mode, the controller
must perform the following steps:
1. Set the REN line low.
2. Address the Model 175 to listen.
NOTE
Setting REN true without addressing will not
cause the RMT annunciator to turn on;
however, once REN is true, the RMT annun
ciator will turn on the next time an addressed
command is received.
Programming Example—This sequence is automatically
sent by the HP-85 when the following is typed into the
keyboard:
REMOTE 724 (END LINE)
After the END LINE key is pressed, the Model 175 RMT an
nunciator should come on. If not, check to see that the in-
3-6
Advertisement
Table of Contents
