Instructions

Model DMM6500
6½ Digit Multimeter User's Manual Section 3:
Using a remote interface
DMM6500-900-01 Rev. B / August 2019 3-15
6. Reconnect the power line cable and any other cables to the rear panel.
7. Turn on the instrument.
Making connections
The RS-232 serial port can be connected to the serial port of a controller using a straight-through
RS232 cable terminated with DB-9 connectors. Do not use a null modem cable.
The serial port uses the transmit (TXD), receive (RXD), CTS and RTS (if flow control is enabled), and
signal ground (GND) lines of the RS232 standard. The figure below shows the rear-panel connector
for the RS232 interface. The table below shows the pinouts for the connector.
Figure 25: KTTI-RS232 panel view
Figure 26: RS-232 panel connector
Pin Description
1
No connection
2
TXD, transmit data
3
RXD, receive data
4
No connection
5
GND, signal ground
6
No connection
7
RTS, ready to send
8
CTS, clear to send
9
No connection
Additional information
Additional information is available in the KTTI-RS232 Communication and Digital I/O Accessory
Instruction Sheet, part number 0771436XX, where XX is the document revision number.