3115T Thin Line Industrial Flat Panel PC Chapter 3 – POS-370 Control Board and BIOS Setup
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141876(E)
COM2: Serial Port DB-9 Male Connector (CN9)
* COM2 supports three modes: RS232, RS422, RS485 (For DB-9 Connector).
Table 3–8. COM2 Pinout (CN9)
Pin No. RS232 Mode RS422 Mode RS485 Mode
1
DCD
TXD-
RTX-
2
RXD
TXD+
RTX+
3
TXD
NC
NC
4
DTR
NC
NC
5
GND
NC
NC
6
DSR
RX-
NC
7
RTS
RX+
NC
8
CTX
NC
NC
9
RI
Voltage
Voltage
COM3: Serial Port 2x5 pin header Connector (CN11)
Table 3–9. COM3 Pinout (CN11)
Pin No. Description
Pin No. Description
1
DCD
6
CTX
2
DSR
7
DTR
3
RXD
8
RI
4
RTS
9
GND
5
TXD
10
NC
COM4: Serial Port 2x5 pin header Connector (CN8)
Table 3–10. COM4 Pinout (CN8)
Pin No. Description
Pin No. Description
1
DCD
6
CTX
2
DSR
7
DTR
3
RXD
8
RI
4
RTS
9
GND
5
TXD
10
NC