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This section provides information on the proper use and configuration of bus remote
interface. The RS-232 remote interface is standard on all 3700 series models.
7.1. RS-232 Interface
This interface is standard on Hypot III. This interface provides all of the control
commands and parameter setting commands. All commands can be found in the
command list, section 7.2.1 to 7.2.5 of this manual.
7.1.1. RS-232 Connector
The RS-232 cabling should be configured as follows for a 9-pin serial port interface:
7.1.2. Communications Port Configuration
The COM port should have the following configuration:
19200 baud
8 data bits
1 stop bit
No parity
This interface does not support XON/XOFF protocol or any hardware handshaking.
The controller should be configured to ignore the handshaking lines DTR (pin 4), DSR
(pin 6) CTS (pin 8) and RTS (pin 7). If the port cannot be configured through software
to ignore these lines the handshake lines should be jumpered together in two different
sets. Pins 4 and 6 should be jumpered together and pins 7 and 8 should be jumpered
together at the controller end of the cable.
7.1.3. Sending and Receiving Commands
Sending Data
Once a command is sent to the instrument over the RS-232 bus the instrument will
send one of two responses. If the transfer was recognized and completed the
instrument will return with 06 hex or 6 decimal, the Acknowledge (ACK) ASCII control
code. If there is an error with the command string that is sent, the instrument will
respond with 15 hex or 21 decimal, the Not Acknowledge (NAK) ASCII control code.
The ACK or NAK response allows for software handshaking to monitor and control
data flow.
Instrument RS-232 Port PC / Bus Controller
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