MT-X1S
Manual
Pins Q0 and Q1
The 32.768KHz crystal is connected to these pins, which serve as the TOSC
input pins of the RTC.
Pins Q2 and Q3
Pin Q2 is routed to the chip select pin of the relay driver. Pin Q3 is routed to the
audio amplifier powerdown pin. Neither pin is routed to a header.
Pins R0 and R1
Both of these pins are routed to an HC49 crystal footprint. A 22pF capacitor is
also connected to each line. If an external clock is used, connect it to R1.
Serial Screw Terminal
Pin 1, which is closest to the port F header, is ground. This should always be
connected, with both RS232 and RS485. Pin 2 is RX (RS232) or inverting (,
RS485). Pin 3 is TX (RS232) or noninverting (+, RS485).
March 2, 2017
12
