KEPCO MST 488 Programmer - Manual (Page 21)

MST 488-27 013004
2-3
2.2.1.3 USING BOTH GPIB ADDRESSING AND RS 232
The same switches are used to configure the RS 232 port and establish the GPIB address; pro-
ceed as follows to use both.
1. First, configure the RS 232 port. The default cnfiguration (9600 baud, Echo = on, XON = off)
corresponds to a GPIB address of 6. If this is acceptable, no further configuration is neces-
sary. Proceed to step 2 to change the RS 232 configuration. If the RS 232 configuration is
OK but the GPIB address needs to be changed, proceed to step 3.
2. For an RS 232 configuration other than the default, refer to PAR. 2.2.1.2. If the GPIB address
that corresponds to the RS 232 configuration needs to be changed, proceed to step 3.
3. To change the GPIB address without changing the RS 232 configuration, use the RS 232
port to send the "syst:comm:gpib:addr n" command (where n = the desired GPIB address).
This allows the DIP switches to determine the RS 232 configuration while the software com-
mand establishes the GPIB address.
2.2.1.4 RS 232 CONNECTIONS
Since the MST 488-27 uses a 9-pin male connector, it is classified as a Data Terminal Equip-
ment (DTE) in accordance with the RS 232 Standard (equipment using a female connector is
classified as Data Communication Equipment, DCE).
Either a DTE-to-DTE or a null modem cable is required to connect the MST 488-27 to an IBM-
PC compatible computer. This cable has only three wires and connects RXD at one end to TXD
at the other end. The RS232-C port control lines (Table 2-4) are used to activate special feature
by means of jumpers at the MST 488-27; refer to Table 2-2 and PAR. 2.2.1 for details. Refer to
PAR. 3.3 for RS 232 operation. NOTE: Be sure the cable used has no unintended internal con-
nections, particularly between RTS and CTS.
2.2.2 START-UP LANGUAGE/COMPATIBILITY MODE/GPIB ADDRESSING DEFAULT (SEE FIG-
URE 2-1)
Program Mode Bits P1 (DIP switch position A6, see Figure 2-1) and P2 (position A7) control the
start-up command language, secondary GPIB addressing with SCPI, and Compatibility Mode
as defined in Table 2-2.
Language - Selection is provided to choose either SCPI or CIIL command language. If SCPI is
selected, you can also choose to implement either primary or secondary GPIB addressing.
Compatibilty Mode - Certain features of the MST 488-27 can be configured to be fully 488.2/
SCPI compatible (Mode 0) or to be backward compatible with previous Kepco products (Mode
1). Differences between Mode 0 and Mode 1 functionality are explained in Table 2-3.