Acces I/O products PCIe-ICM-2S, Руководство пользователя

Страница: 17 / 19

PCIe-ICM-4SM User Manual
17
Chapter 6: Connector Pin Assignments
Input/Output Connections
The serial communications ports are interfaced at the card and adjacent mounting brackets
via 4x DB9M connectors.
PIN RS-232
RS-422 and
4-Wire RS-485
2-Wire RS-485
1 DCD TX- -
2 RX TX+ -
3 TX RX+ TX+/RX+
4 DTR RX- TX-/RX-
5 GND GND GND
6 DSR - -
7 RTS - -
8 CTS - -
9 RI - -
Table 6-1: DB9 Male Connector Pin Assignments
Figure 6-1: DB9 Male Connector Pin Locations
RS-232
Signals
RS-232 Signal
Descriptions
RS-422
Signals
(4-w 485)
RS-422 Signal
Descriptions
RS-485
Signals
(2-wire)
RS-485 Signal
Descriptions
DCD Data Carrier Detected TX+ Transmit Data + TX/RX + Transmit / R
RX Receive Data TX- Transmit Data - TX/RX - Transmit / Receive -
TX Transmit Data RX+ Receive Data + GND Signal Ground
DTR Data Terminal Ready RX- Receive Data -
GND Signal Ground GND Signal Ground
DSR Data Set Ready
RTS Request To Send
CTS Clear to Send
RI Ring Indicator
Table 6-2: COM signal names to corresponding signal descriptions
To ensure that there is minimum susceptibility to EMI and minimum radiation, it is important
that the card mounting bracket be properly screwed into place and that there be a positive
chassis ground. Also, proper EMI cabling techniques (cable connect to chassis ground at the
aperture, shielded twisted-pair wiring, etc.) should be used for the input/output wiring.