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Appendix B I/O Interface Board
24 QuickStart Guide CoreModule 800
I/O Interface Board Connectors
Table B-2 lists the interface between Utility 1a (J4) and the other connectors/devices on the I/O Board.
Table B-2. Utility 1a Interface Pin/Signal Descriptions (J4)
J4
Pin #
Signal
Pin # On-
board
Description
1DCD0*
(Serial 1/
COM1)
J7-1 Data Carrier Detect 0 – Indicates external serial device is detecting a
carrier signal (i.e., a communication channel is currently open). In
direct connect environments, this is be driven by DTR0 as part of the
DTR0/DSR0 handshake.
2DSR0*J7-6
Data Set Ready 0 – Indicates external serial device is powered,
initialized, and ready. Used as hardware handshake with DTR0 for
overall readiness to communicate.
3RXD0
RX0-
J7-2 Receive Data 0 Input – This receive data line 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 RTS0 line to allow the
transmission to complete.
Receive Data 0 Negative – If in RS-485 mode, this pin is RX0-.
4RTS0*
TX0+
J7-7 Request To Send 0 – Indicates serial port is ready to transmit data. Used
as hardware handshake with CTS0 for low level flow control.
Transmit Data 1 Positive – If in RS-485 mode, this pin is TX0+.
5TXD0
TX0-
J7-3 Transmit Data 0 Output – This line is typically held to a logic 1 when
no data is being sent. A logic 0 (On) must be present on RTS0, CTS0,
DSR0, and DTR0 before data can be transmitted on this line.
Transmit Data 0 Negative – If in RS-485 mode, this pin is TX0-.
6CTS0*
RX0+
J7-8 Clear To Send 0 – Indicates external serial device is ready to receive data.
Used as hardware handshake with RTS0 for low level flow control.
Receive Data 0 Positive – If in RS-485 mode, this pin is RX0+.
7 DTR0* J7-4 Data Terminal Ready 0 – Indicates port is powered, initialized, and
ready. Used as hardware handshake with DSR0 for overall readiness.
8 RI0* J7-9 Ring Indicator 0 – Indicates external serial device is detecting a ring
condition. Used by software to initiate operations to answer and open
the communications channel.
9 GND J7-5 Digital Ground
10 PS_ON
SW1-3/
-4
Power Supply On –
11 DCD1*
(Serial 2/
COM2)
J7-10 Data Carrier Detect 1 – 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 DTR1 as part of the
DTR1/DSR1 handshake.
12 DSR1* J7-15
Data Set Ready 1 – Indicates external serial device is powered,
initialized, and ready. Used as hardware handshake with DTR1 for
overall readiness.
13 RXD1 J7-11
Receive Data 1 Input – This line 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 RTS1 line to allow the
transmission to complete.