Acrosser AMB-IH61T3 (Mini-ITX) - Manual (Page 14)

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[14] RS485 Header (COM3, 3*1 Pin 2.54mm)
Location Header Pin Definition Pin Definition
J_1
1 RS485- 2 GND
3 RS485+
[15] COM7-10Headers（20*2 Pin 2.00 mm）
Location Header Pin Definition Pin Definition
J_COM7-10
1 COM7_DCD 2 COM7_RXD
3 COM7_TXD 4 COM7_DTR
5 GND 6 COM7_DSR
7 COM7_RTS 8 COM7_CTS
9 COM7_RI 10 GND
11 COM8_DCD 12 COM8_RXD
13 COM8_TXD 14 COM8_DTR
15 GND 16 COM8_DSR
17 COM8_RTS 18 COM8_CTS
19 COM8_RI
21 COM9_DCD 22 COM9_RXD
23 COM9_TXD 24 COM9_DTR
25 GND 26 COM9_DSR
27 COM9_RTS 28 COM9_CTS
29 COM9_RI 30 GND
31 COM10_DCD 32 COM10_RXD
33 COM10_TXD 34 COM10_DTR
35 GND 36 COM10_DSR
37 COM10_RTS 38 COM10_CTS
39 COM10_RI 40 GND