BNC 555 Series, User Manual, Page: 27 / 47

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COMPUTER INTERFACE
Serial Port Pinout
1. No Connection
2. Tx - Transmit (to computer)
3. Rx - Receive (from computer)
4. DTR - connected to pin 6
5. Ground
6. DSR - connected to pin 4
7. RTS - connected to pin 8
8. CTS - connected to pin 7
9. No connection
A standard straight through cable is used with most PCs.
Programming Command Types and Format
The Model 555 Pulse Generators use two types of programming commands: IEEE 488.2
Common Commands and Standard Commands for Programmable Instruments (SCPI). The
format is the same for both the RS232 interface and the optional IEEE 488 interface.
Hyperterminal (in Windows) or any other generic terminal program may be used to interactively
test the commands using the RS232 interface. The format of each type is described in the
following paragraphs.
IEEE 488.2 Common Command Format
The IEEE 448.2 Common Commands control and manage generic system functions such as
reset, self-test, and identification. Common commands always begin with the asterisk (*)
character and may include parameters. The parameters are separated from the command
pneumonic by a space character. For Example:
*RST <cr> <lf>
*RCL 1 <cr> <lf>
*IDN? <cr> <lf>
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