9-16 Remote Operation Model 6485 Picoammeter Instruction Manual
Response Message Terminator (RMT)
Each response is terminated with an LF (line feed) and EOI (end or identify). The follow-
ing example shows how a multiple response message is terminated:
0; 1; 1; 0; <RMT>
Message exchange protocol
Two rules summarize the message exchange protocol:
Rule 1. Always tell Model 6485 what to send to the computer.
The following two steps must always be performed to send information from the
instrument other computer:
1. Send the appropriate query command(s) in a program message.
2. Address Model 6485 to talk.
Rule 2. The complete response message must be received by the computer before another
program message can be sent to Model 6485.
RS-232 interface reference
Sending and receiving data
The RS-232 interface transfers data using seven or eight data bits and one stop bit. Parity
selections include none, odd or even.
When using the RS-232 interface, the unit will not respond to DDC or general GPIB com-
mands (undefined header error) see Table 9-1. See Table 13-3 for SCPI equivalents to
selected general commands.
RS-232 settings
The procedure to select and configure the RS-232 interface is provided in “Selecting and
configuring an interface,” page 9-2. Make sure the controller you connect to Model 6485
also uses these settings.
NOTE You can break data transmissions by sending a ^C or ^X character string to
Model 6485. This clears any pending operation and discards any pending out-
put.
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