KEPCO TMA 4882-27 - Manual (Page 20)

2-2
TMA 4882-27 021910
2.2.1.2 USING RS 232 ONLY
If the default configuration (9600 baud, Echo = on, XON = off) is acceptable, leave DIP switch
positions 1-5 as is. To change from the default configuration, install an external jumper between
RTS and CTS on the RS 232 cable at the TMA 4882-27. The RS 232 Port can now be config-
ured using the DIP switches. Place TMA 4882-27 controller with rear panel unit facing you. The
Device Address DIP switches are positions 1 through 5 (from left to right, see Figure 2-1).
• Baud Rate: Sw Pos 4/5 (00 = 9600, 11 = 19200, 10 = 4800, 01 = 2400)
• Echo: Sw Pos 3 (1 = enable, 0 = disable)
• XON: Sw Pos 2 (1 = disable, 0 = enable)
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 configuration (9600 baud, Echo = on, XON =
off) corresponds to a GPIB address of 6. If this is acceptable, no further configuration is nec-
essary. 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 TMA 4882-27 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 TMA 4882-27 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 TMA 4882-27; refer to Table 2-2 and PAR. 2.2.1 for details. Refer to
PAR. 3.5 for RS 232 operation. NOTE: Be sure the cable used has no unintended internal con-
nections, particularly between RTS and CTS.