Serial Interface - Laird CL4790 Hardware Integration Manual

CL4790 Hardware Integration Guide
Version 3.0
S I
ERIAL NTERFACE
 CL4790 Serial Interface
Hardware Flow Control

The CL4790 supports the following protocols, which are separate products:
RS232

 RS485
CL4790 Serial Interface
RS232
Figure 2: CL4790-RS232
RS232 is a single-ended data transmission protocol. The RS232 signals are represented by voltage levels with
respect to a system common (power/logic ground). The "idle" state (MARK) has the signal level negative with
respect to common, and the "active" state (SPACE) has the signal level positive with respect to common.
Table 3: CL4790 DB9 Male Connector Pinout (as defined at the CL4790)
Signal Name
DB9 Pin
DCD
1
TXD (RXD with respect to DTE)
2
RXD (TXD with respect to DTE)
3
DTR
4
GND
5
DSR
6
RTS
7
CTS
8
RI
9
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Description Direction
Data Carrier Detect Out
Transmit Data Data Out to Host
Receive Data Data In to CL4790
Data Terminal Ready In
Ground -
Data Set Ready
Out
Request to Send In
Clear to Send Out
Ring Indicator Out
8 CONN-HIG_CL4790