Programming Guide – 30
In SCPI mode, the message terminating sequence is automatically set to <LF>.
Switching between Remote and Local Operation
The attenuator is automatically placed in Remote mode as soon as a computer communicates
with the attenuator via the GPIB or RS232 port using the SCPI or HA command set.
The REM status LED lights to indicate that the attenuator has transitioned to Remote mode
and can accept commands from the GPIB or RS232 port, and that all front panel keys except
LCL are locked out. The LCL key remains active to return the control back to front panel keys.
To exit Remote mode and return to Local mode:
1. Press the LCL key. (The LCL key is disabled if the attenuator has been set to Local
Lockout mode.) The REM LED is lit when the attenuator is in Remote mode.
GPIB Interface Functions
The functions are listed in Table 6.
Table 6: GPIB Functions
Mnemonic
IEEE 488.2 Function
SH1
source handshake, complete capability
AH1
acceptor handshake, complete capability
T6
basic talker, serial poll, unaddressed if MLA
L4
basic listener, unaddressed if MTA
SR1
service request capability
RL1
remote/local, complete capability
PP0
parallel poll, no capability
DC1
device clear, complete capability
DT0
device trigger, no capability
C0
controller, no capability
E1
electrical interface, open collector drivers
RS232 Interface Functions
The functions are listed in Table 7.
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