Table 3-5. Serial 2 (Com2) Interface Pin Signal Descriptions (H16) - ADLINK Technology CoreModule 920 Reference Manual

Chapter 3
Table 3-4 defines the pins and corresponding signals for the Serial 2 header, which consists of 10 pins, 2
rows, odd/even sequence (1, 2), and 0.100" (2.54mm) pitch.

Table 3-5. Serial 2 (COM2) Interface Pin Signal Descriptions (H16)

Pin # Signal
1 S2_DCD*
2 S2_DSR*
3 S2_RXD
4 S2_RTS*
5 S2_TXD
6 S2_CTS*
7 S2_DTR*
8 S2_RI*
9 GND
10 GND
Note: The shaded table cells denote ground. The * symbol indicates the signal is Active Low.
26
DB9 Description
Pin #
1 COM2 Data Carrier Detect – Indicates external serial device is detecting
a carrier signal (i.e., a communication channel is currently open). In
direct connect environments, this input is driven by DTR as part of the
DTR/DSR handshake.
6 COM2 Data Set Ready – Indicates external serial device is powered,
initialized, and ready. Used as hardware handshake with DTR for overall
readiness.
2 COM2 Receive Data – Serial port receive data input is typically held at a
logic 1 (mark) when no data is being transmitted, and is held "Off" for a
brief interval after an "On" to "Off" transition on the RTS line to allow
the transmission to complete.
7 COM2 Request To Send – Indicates serial port is ready to transmit data.
Used as hardware handshake with CTS for low level flow control.
3 COM2 Transmit Data – Serial port transmit data output is typically held
to a logic 1 when no data is being sent. Typically, a logic 0 (On) must be
present on RTS, CTS, DSR, and DTR before data can be transmitted on
this line.
8 COM2 Clear To Send – Indicates external serial device is ready to
receive data. Used as hardware handshake with RTS for low level flow
control.
4 COM2 Data Terminal Ready – Indicates serial port is powered,
initialized, and ready. Used as hardware handshake with DSR for overall
readiness.
9 COM2 Ring Indicator – Indicates external serial device is detecting a
ring condition. Used by software to initiate operations to answer and
open the communications channel.
5 Ground
10 Ground
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