Instruction manual

6 OPERATING INSTRUCTIONS FOR THE BOS/S CONTROLLER
6.1 GENERAL
The BOS/S controller is designed to functionally duplicate all of the controls on the
front panel of a BOS/S power Supply. These controls select the control programming
mode (Voltage or Current), control channel programming level, and positive and
negative limit channel programming levels. The only requirement is that the front
panel external programming inputs (Voltage and Current) be open when using the
BOS/S controller. All other controls and switches are internally bypassed by the
controller board.
6.2 GPIB AND RS232 INTERFACES
The BOS/S controller interfaces to a computer using either GPIB or RS232C (or both)
data transfer methods. The controller accepts a command string from either port and
processes that string. If any messages are generated by the command string (eg.
Voltage Readback) the message is placed in an output buffer.
After the command string is processed the contents of the output buffer are
transmitted over the RS232 lines (if not disabled by the rear switches). At any time the
output buffer may be read using the GPIB. All messages are terminated with a
carriage-return and a linefeed character.
The BOS/S controller implements the following GPIB interface functions:
SH1 (Source Handshake)
AH1 (Acceptor Handshake)
T6 (Talker)
L4 (Listener)
DC1 (Device Clear)
C0 (No Controller)
The response of the BOS/S controller to a Clear is to zero the control programming
DAC. The positive and negative limit DAC’s are not changed. If the power supply is in
remote mode there will be no change in supply output. However, unless a new value
is programmed in for the control channel, the power supply will be zeroed upon
returning to remote operation.
The GPIB address and the RS232 baud rate are selected using the 8-position DIP
switch on the rear of the BOS/S. The settings are as follows:
9600 Baud111
4800 Baud011
2400 Baud101
1200 Baud001
600 Baud110
300 Baud010
150 Baud100
RS232 Disabled000
IEEE AddressAD1AD2AD3AD4AD5
RS232 Baud RateXXX
FunctionSW8SW7SW6SW5SW4SW3SW2SW1
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83-469-001 Rev. B