Atec 6900K User Manual

6900K6 Series

• IEEE-488

• CIIL /MATE Compatible

• Talker and Listener

• Interface Built-In

The 6900K6 Series are GPIB controllable versions of the popular CPI 6900K4 series
low power commercial TWT amplifiers.

CPI 6900K6 series TWT amplifiers are manufactured with the same quality as all CPI
amplifiers and are backed by CPI’s worldwide 24-hour customer support network that
includes 9 regional factory service centers. Quality, reliability and product support are
integral parts of your CPI power amplifier.

Features

Description

Selection
Guide

20 Watt P ower Amplifier

Rated Frequency Small Signal

Output Power Range Gain at Rated Power

(Watts) Model # (GHz) (dB)

VZC-6961K6 4-8 35 min.

20

VZX-6981K6 8-12.4 40 min.
VZU-6991K6 12.4-18 40 min.

VZM-6991K6 8-18 40 min

VZV-2776K6 4-18 35 min.

These units can function as either a GPIB Listener or a Talker; i.e., the TWTA can be controlled by the
external computer and report on its status.

When addressed as a Listener, the TMA causes the amplifier to take some action such as turning
high voltage ON.

When addressed as a Talker, the amplifier sends back information on its operating or fault condition.

Local operation is possible by enabling the front panel controls; however, incoming Bus commands
will override the front panel unless an internal safety switch has been set to prevent it.

Two control languages are included; CPI Simplified Language (CSL) and a version of the Air Force’s
Control Interface Intermediate Language (CIIL). An internal switch allows quick selection of language.

wireless solutions

INSTRUMENTATION
AMPLIFIERS

Specifications

Language

Refer to CPI 6900K4 Series data sheets for detailed specifications of the basic unit. This data sheet covers
only those specifications which apply to the interface itself.

Listener Functions • High Voltage On/Off

• Fault Reset

• Heater On/Off

Talker Functions • Heater Power ON

• HV ON

• Summary Fault

• Interlock Fault

• Heater Time Delay

• Standby

• Helix Fault

• Thermal Fault

Data Interface IEEE Std. 488-1978. Driver and receiver circuits are fully Bus compatible.

Receivers contain Bus terminating resistors and have 500 mV hysteresis.
Drivers are open collector devices, capable of driving up to 14 other Bus
compatible devices. Power up/down protection is included to prevent transmitting
invalid data to the Bus or holding the Bus when power is off.

Format Sixteen lines, eight for data and eight for control and status messages. Data

transfer is byte serial using a three-wire handshake per IEEE-488 Standard.

Address Capability Unit recognizes 31 primary addresses (address 0 through 30) or 31 secondary

addresses with a fixed primary address of 17 (address 1700 through 1730).

Interface Handshake
Repertoire:

CPI Simplified A simplified version of CIIL. All commands enclosed in brackets are deleted. In
Language (CSL) addition, the SRQ function is enabled allowing serial and parallel polling as well

as the “D” command status request.

Control Interface Compatible per proposed MATE System Control Interface Standard No. 2806763
Intermediate Language Rev. B. Several non-CIIL approved noun modifiers have been defined as required
(CIIL)

by a TWTA. CIIL required commands are indicated herein enclosed by brackets [ ].

Listener Operation
Codes and Statements

Set-Up Statements

Set-Up to Standby

FNC [SGC :CHØ SET GAIN 50 SET] VLST CR [LF]

If this command is received during the ON mode, high voltage will be switched
OFF and the amplifier placed in Standby; i.e., heater ON, high voltage OFF.

If this command is received when the heater is OFF, the heater will be switched
ON and the amplifier will switch to Standby at the end of the Heater Time Delay
period.

Set-Up to ON FNC [SGC :CHØ SET GAIN 50 SET] VLON CR [LF]

If this command is received when the amplifier is in Standby, the High Voltage
will be switched ON.

If this command is received when the amplifier is still in Heater Time Delay, High
Voltage will be switched ON at the end of the delay period.

If this command is received when the heater is OFF, the heater will be switched
ON and the amplifier will switch to High Voltage ON at the end of the Heater Time
Delay period.

Function Code Comments

Source Handshake SH1 Implemented
Acceptor Handshake AH1 Implemented
Talker T5 Implemented
Extended Talker TE5 Implemented
Listener L3 Implemented
Extended Listener LE3 Implemented
Service Request SR1 Implemented
Parallel Poll PP1 Implemented
Remote/Local RL0 Not Implemented
Device Clear DC1 Implemented
Device Trigger DT1 Implemented
Controller C0 Not Implemented
Bus Driver E1 Open Collector

Function Op-Code Noun Modifier

FNC = Function SGC = Signal Conditioner GAIN = Gain
CHØ = Channel Ø VLST = Standby
SET = Set VLON = Voltage ON
RST = Reset
STA = Status