5-32
The GPIB Interface
Output Status Bits for Service Requests
After the power is turned ON, sending the command, "S1" allows "Service Requests" to be used.
The status bits for the 3550 are positioned as indicated below.
Figure 5.5 – GPIB Status Bits
0 SRQ 0
Command
Error
0
Data
Continue
Hand Shake
Error
Data Ready
Bit6: If a Service Request occurs under program code "S1", this will become "1" and the SRQ Line
will be "True".
Bit4: When improper program codes or numerical data are received, this will become "1".
Bit2: While data flow is continuing, this will be "1".
Bit1: If a GPIB Handshake Error, or an unknown command is received, this will become "1".
Bit0: When data to be output is ready to go, this will become "1".
Additional Notes for Using the GPIB Interface
1) Almost all of the switches on the front and rear panel of the 3550 can be controlled remotely
through an external controller.
2) The 3550 should be designated as the Listener, and the necessary measurement parameter
program codes should be sent from the controller. The program codes for GPIB are the same as
the program codes for the RS-232C.
3) By setting "E1" within the program code, measurement using a "GET" message is possible. If
"E2" is set; measurements will be made every time the "MAN/EXT" key on the panel is pressed.
4) The controller will then designate the 3550 as the Talker, and read the data.
5) If you would like to issue Service Requests from the serial poll, make sure that the controller
reads the status bit related to the request.
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
(DIO8) (DIO7) (DIO6) (DIO5) (DIO4) (DIO3) (DIO2) (DIO1)
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