Quick Reference
– IT-E177: Interface card that includes RS232 communication interface,
external analog and other functions.
The accessory has a total of 10 pins, and the details of each pin are as
follows:
Pins Description
1 RS232 TXD pin for transmitting data.
2 RS232 RXD pin for receiving data.
3 RS232 DGND pin for grounding.
4 Ground terminal, that is, the negative terminal of pin 5 to pin
10.
5 Voltage monitoring terminal. It can output a voltage of 0 to
10V to monitor the output voltage from 0 to full scale.
6 Current monitoring terminal. It can output a voltage of 0 to
10V to monitor the output current from 0 to full scale output
current.
7 Reference voltage (10V) test terminal. The accuracy is
0.03%. You can use a multimeter to measure this pin. When
the output voltage of the pin is in the range of 10±0.03%*10, it
indicates that the accessory is functioning normally. Other-
wise, the function is abnormal and cannot be used.
8 / 9 Terminals for external analog function. For details, see 4.5
Analogue Function (Ext-Program) (Optional).
10 not used
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