111
No parity
This interface does not support XON/XOFF protocol or any hardware handshaking.
The controller should be configured to ignore the handshaking lines DTR (pin 4), DSR
(pin 6) CTS (pin 8) and RTS (pin 7). If the port cannot be configured through software
to ignore these lines the handshake lines should be jumpered together in two different
sets. Pins 4 and 6 should be jumpered together and pins 7 and 8 should be jumpered
together at the controller end of the cable.
7.1.3. Sending and Receiving Commands
Sending Data
Once a command is sent to the instrument over the USB/RS-232 bus the instrument
will send one of two responses. If the transfer was recognized and completed the
instrument will return with 06 hex or 6 decimal, the Acknowledge (ACK) ASCII control
code. If there is an error with the command string that is sent, the instrument will
respond with 15 hex or 21 decimal, the Not Acknowledge (NAK) ASCII control code.
The ACK or NAK response allows for software handshaking to monitor and control
data flow.
Receiving Data
When requesting data from the instrument it will automatically send the data back to
the controller input buffer. The controller input buffer will accumulate data being sent
from the instrument, including the ACK and NAK response strings, until it has been
read by the controller.
7.2. GPIB Interface
This interface is optional on the OMNIA and provides all of the control commands and
parameter setting commands of the RS-232 interface along with 488.2 Common
Commands and SRQ capability. All commands can be found in section
7.4. RS-
232/GPIB Command List
.
7.2.1. GPIB Connector
Connection is usually accomplished with a 24-conductor cable with a plug on one end
and a connector at the other end. Devices may be connected in a linear, star or a
combination configuration.
The standard connector is the Amphenol or Cinch Series 57 Microribbon or AMP
CHAMP type. The GPIB uses negative logic with standard transistor-transistor logic
(TTL) levels. When DAV is true, for example, it is a TTL low level (
0.8 V), and when
DAV is false, it is a TTL high level (
2.0 V).
Restrictions and Limitations on the GPIB
A maximum separation of 4 m between any two devices and an average
separation of 2 m over the entire bus.
A maximum total cable length of 20 m.
Summary of Contents for OMNIA II 8204
Page 8: ...2 This Page Intentionally Left Blank ...
Page 87: ...81 conditions The different combinations are represented in the table below ...
Page 91: ...85 ...
Page 92: ...86 ...
Page 139: ...133 7 128 Power On PROMPT ESR ESE STB SPOLL SRE ESE SRE ...
Page 142: ...136 ...
Page 156: ...150 appear on the display ...
Page 169: ...163 Print Report Example ...
Page 181: ...175 ...