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INPUT #2, y
IF y THEN
PRINT #1, "spoll 04"
INPUT #2, x
END IF
WEND
PRINT #1, "output 04;fetc?"
PRINT #1, "enter 04"
INPUT #2, c$
PRINT c$
PRINT #1, "output 04;system:lock 0"
PRINT #1, "local"
END
2.7.5 RS232 Interface
The 1865 instrument comes standard with an RS232 serial port interface, available
through a connector (9 pin) on the rear panel of the instrument, for connecting to a PC.
The RS232 standard defines electrical specifications for the transmission of bit serial
information. The use of the RS232 port requires five lines: receive data, transmit data,
data terminal ready, data set ready and signal ground. With some controllers additional
signals maybe required and are listed in Table 2-6. Refer to Figure 2-34 for null modem
cable configuration to the standard db9 or db25 connector. Refer to Table 2.5 for the
command set which also applies to the RS232 interface. When using the RS-232
interface with a printer the IEEE-488 Mode must be set to Talk and the State to Disable .
Signal Name
Pin Number
DCD
DSR
RXD
CTS
RI
RTS
TXD
DTR
GND
Operation
Table 2-6: RS232 Interface Connections
Input:
1
6
2
8
9
Outputs:
7
3
4
5
'request data
'get data
'enable front panel
Function
Data Carrier Detect
Data Set Ready
Receive Data
Clear to Send
Ring Indicator
Request to Send
Transmit Data
Data Terminal Ready
Signal Ground
Page 67 of 87
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