BIRD THRULINE 4021, Instruction Book

Page: 26 / 62

Bird 4421 RF Power Meter
16
General Bus Commands
The general bus commands supported by the IEEE-488 interface
module are listed in Figure 12. The syntax for executing general
commands varies among controllers; check the documentation
supplied with your controller for the proper command structure.
R emote EN able (REN)
Function
Enables remote operation.
Remarks
The unit must be addressed to listen after setting REN true.
The REMOTE indicator turns on when this command is received.
G o T o L ocal (GTL)
Function
Returns device to local operation.
Remarks
Issuing a GTL command while the device is in Local Lockout mode
does not clear the lockout condition.
The REMOTE indicator turns off.
The LISTEN indicator remains on.
L ocal LO ckout (LLO)
Function
Disables local operation of all devices on the bus.
Remarks
REN must be true to use LLO.
LLO is cleared by setting REN false.
Figure 12
IEEE-488
General Bus
Commands
Command Effect on Bird 4421
REN
Goes into remote mode when next addressed
GTL
Cancels remote mode, restores local operation
LLO
Locks out local operation
IFC
Goes into talker and listener-idle status
DCL
Returns to default conditions
SDC
Returns to default conditions
GET
Triggers reading in T2 and T3 modes
SPE, SPD
Puts the status byte on the bus