Copyright ©ITECH Electronic Co., Ltd.  143 
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PC and the instrument must have the same baud rate. 
• 
Ensure you have used the correct communication cable (CAN_H, 
CAN_L).  Please  pay  attention  that  some  cable  may  not  have  a 
correct internal wiring even it is with an appropriate plug. 
• 
The interface cable is correctly connected (CAN_H to CAN_H, 
CAN_L to CAN_L). 
• 
If the communication signal is poor or unstable, it is recommended 
to con- nect a 120 Ω terminating resistance. 
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The connection diagram of a single device is as below. 
 
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The connection diagram of multiple devices is as below. 
 
 
When multiple devices are connected, it is recommended to 
connect the pin 8 (GND) of the P-IO terminal on the rear panel 
of these devi- ces in parallel, and the communication quality 
will be improved in the entire CAN network. 
10.4 GPIB Interface (Optional) 
The GPIB (IEEE-488) interface is assembled in the IT-E176 communication board. 
Use a GPIB cable to connect GPIB interfaces of the instrument and PC. Please ensure 
that the screws have been screwed down in order to have a full connection. 
GPIB Configuration 
Each device on the GPIB (IEEE-488) interface must have a unique whole num-  ber 
address between 1 and 30. Your computer’s GPIB interface card address must not 
conflict with any instrument on the interface bus. This setting is nonvo- latile; it will 
not be changed by *RST. 
When you purchase  the interface accessory  and  successfully insert it  into the 
corresponding position on the rear panel of the instrument, the menu item for 
changing the GPIB address appears in the System menu. The specific steps are as 
follows: 
1. 
Ensure that the instrument's power switch is off, that is, the instrument is