User manual

26
GPIB to TTL adapter IT-E135 (Model 9123A only)
The DB9 interface connector on the rear panel of the power supply provides a TTL voltage level interface. Use
the communication adapter IT-E135 to communicate via GPIB
PC
Connect this
side to your
computer’s
GPIB
interface
(GPIB cable
not included)
Power Supply
Connect this
connector to
DB9 TTL
connector of
power supply
(serial cable
included)
Connect external
AC power
adapter
(included)
Recommended power up sequence:
Connect the IT-E135 adapter to your computer and to the power supply as indicated in the above figure. Connect
the external power adapter. Both TX and RX LED should be lit (provided the power supply is turned off)
Turn on power supply. The TX and RX LEDs will turn off
For maximum throughput, set the baudrate to 38400. Set parity to NONE (default setting). Set address to the
desired GPIB instrument address.
Note: The RX LED and TX LEDs will flicker to indicate activity on the GPIB bus. The RX LED indicates a
write command (from controller’s perspective), the TX LED will indicate data transmission from power supply
to GPIB controller.
4.2 Communication between Power Supply and PC
Before putting the instrument into remote operation, make sure that the baud rate, parity bit and communication
address settings on the power supply and computer side are identical, otherwise communication will not be
possible.
1． Address Range is 0 to 30. Default setting is 0.
2． Baud rate: 4800,9600,19200 and 38400 are selectable, default setting is 9600
3． Parity and Data bits： None/8 bits (default setting)
Even/8 bits
Odd/8 bits
4． Stop bits：1 (fixed)
5． Start Bits: 1 (fixed)