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是几伏的TTL电平,PGA460的TSET管脚如果是悬空的,那么PGA460就是3.3V的电平,如果PGA460的TSET管脚接上拉了,那么PGA460就是5V的电平
硬件方面没问题后,请确保您使用的是
8 data bits
1 start bit
2 stop bit
No parity bit
•No flow control
以及2400 bps to 115 200 bps波特率