Contec SEH-9450-LAS - Manual (Page 21)

3. Hardware Installations
14
SEH-9450-LAS
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
PIN No. RS-232C RS-422 RS-485
1 DCD TX- TX-
2 RXD TX+ TX+
3 TXD RX+ RX+
4 DTR RX- RX-
5 GND GND GND
6 DSR N.C. N.C.
7 RTS N.C. N.C.
8 CTS N.C.
N.C.
9 RI N.C. N.C.
COM1 / COM2
1
6
5
9
10 N.C. N.C. N.C.
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.
RTS#
R
D
1ΚΩ
JCOM1: 14-6
JCOM1: 15-6
SOUTB
6.2ΚΩ
6.2ΚΩ
4.7KΩ
4.7KΩ 4.7KΩ 4.7KΩ 4.7KΩ
4.7KΩ
10 5
6 1
Figure 3.1. RS-422 / RS-485