Serial Port Connector: Com1 / Com2; Rs-422 / Rs-485 Specifications - Contec Single Board Computer Half-size PICMG 1.3 with LAN, Audio, SATA SEH-9450-LAS User Manual

3. Hardware Installations

Serial Port Connector: COM1 / COM2

Serial 1 (COM1), Serial 2 (COM2), are onboard serial ports of the product. The following table shows
the pin assignments of these connectors.
Table 3.4. Serial Port Connector
COM1 / COM2
6
9
1 5
CAUTION
- For RS-485, TX+(pin 2) and RX+ (pin 3) must jumper together inside the D type connector.
- TX- (pin 1) and RX- (pin 4) is the same.

RS-422 / RS-485 specifications

- Transmission system: Asynchronous, half-/full-duplex serial transmission conforming to
RS-422/RS-485
- Baud rate : 115,200 - 50bps (programmable)
- Signal extensible distance: 1.2km Max.
4.7 K Ω
4.7 K Ω 4.7 K Ω
JCOM1: 14-6
1ΚΩ
JCOM1: 15-6
Figure 3.1. RS-422 / RS-485
14
PIN No. RS-232C
1 DCD
2 RXD
3 TXD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
10 N.C.
RTS#
4.7 K Ω 4.7 K Ω
R
4.7 K Ω
SOUTB
D
RS-422 RS-485
TX- TX-
TX+ TX+
RX+ RX+
RX- RX-
GND GND
N.C. N.C.
N.C. N.C.
N.C. N.C.
N.C. N.C.
N.C. N.C.
6.2ΚΩ
6.2ΚΩ
10 5
6 1
SEH-9450-LAS