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1101 and 1102 Secure Device Servers
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Table 3-1. RS-232 DB9 connector pinouts.
Signal Pin Definition
CD 1 Received Line Signal Detector
RXD 2 Received Data
TXD 3 Transmitted Data
DTR 4 Data Terminal Ready
GND 5 Signal Ground
DSR 6 Data Set Ready
RTS 7 Request To Send
CTS 8 Clear To Send
RI 9 Ring Indicator
3.3.1 Non RS-232 Serial Port Pinouts— LES1102A
Port 2 on the LES1102A can also be software selected to be an RS-485 or RS-422 port connected through the screw terminal block (pinout shown
in Table 3-2.
Table 3-2. Non RS-232 serial port pinout for the LES1102A.
1 +V DC IN
2 GND
3 RX+
4 RX-
5 TX+
6 TX-
7 +3.3V DC OUT
8 GND
Figure 3-2. Front panel of the LES1102A showing pinout connections on the left side.
RS-422 uses a full-duplex transmit on TX+/TX- pair, receive on RX+/RX- pair.
RS-485 uses half-duplex over single pair. The LES1102A supports half duplex “party-line” communications over a 2-wire RS-485 bus (D+/D-). This is
enabled by choosing the RS-485 option (instead of RS-232 or RS-422) for “Signaling Protocol” from the “Serial Port: Configuration” link on the