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1.7.
Switches
1.7.1. Power Switch (JP1)
The Power Switch turns EZL-90 on.
1.7.2. Reset Switch (S1)
Reset Switch resets EZL-90. And it is connected to RST of JP8.
1.8.
Level Converter (U2)
It converts TTL signal of EZL-80c to RS232 signal via versa.