Status Byte Definition; Configuration Switches - Stanford Research Systems SR530 Manual

Status Byte Definition

Bit Meaning
0 Magnitude too small to calculate
phase
1 Command Parameter is out-of-range
2 No detectable reference input
3 PLL is not locked to the reference
4 Signal Overload
5 Auto-offset failed: signal too large
6 SRQ generated
7 Unrecognized or illegal command
There are two banks of 8 switches, SW1 and
SW2, located on the rear panel. SW1 sets the
GPIB address and SW2 sets the RS232
parameters. The configuration switches are read
continuously and any changes will be effective
immediately.
SW1:GPIB Mode Switches
Bit Example Function
1 } up GPIB Address Switches
2 } up Address 0 to 30 allowed
3 } up 'up' for bit = 1
4 } down 'down' for bit = 0
5 } up (Most Significant Bit)
6 down 'down' to echo on RS232
(normally 'up')
7 up Not Used
8 up Not Used
If the GPIB mode switches are set as shown in the
example column above, then the lockin will be
addressed as GPIB device #23, and all GPIB
commands and data will be echoed over the
RS232 for de-bugging purposes.

Configuration Switches

SW2:RS232 Mode Switches
Bit 1
up
down
up
down
up
down
up
Bit
4
5
6
7
8
Eight data bits are always sent, regardless of the
parity setting. The most significant bit is always
zero.
Example: Bit 1 'down' and all others 'up' for
RS232 communication at 9600 baud, no parity,
two stop bits, and no echo or prompts by the
SR530.
8
Bit 2 Bit 3 Baud Rate
up up 19200
up up 9600
down up 4800
down up 2400
up down 1200
up down 600
down down 300
Setting Explanation
up Odd parity
down Even parity
up No parity
down Parity enabled
up No echo (for computer)
down Echo mode (for terminal)
up Two stop bits
down One stop bit
unused