Ampro Corporation PCI-104 quick start Signal From Description Pin # Onboard Connector

Appendix B I/O Interface Board

Table B-4 lists the connections on the I/O Board between the Serial Port 1 connector (J7) and the Utility 1Connector (J1).

Table B-4. Serial Port 1 Interface Pin/Signal Descriptions (J7B)

J7	Signal	From	Description
Pin #		Onboard
		Connector
		& Pin #
1	DCD1*	J4-1	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.
2	RXD1	J4-3	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.
	RX1-		Receive Data 1 Negative – If in RS485 mode, this pin is RX1-.
3	TXD1	J4-5	Transmit Data 1 Output – This line is typically held to a logic 1 when
			no data is being sent. Typically, a logic 0 (On) must be present on
			RTS1, CTS1, DSR1, and DTR1 before data is transmitted on this line.
	TX1-		Transmit Data 1 Negative – If in RS485 mode, this pin is TX1-.
4	DTR1*	J4-7	Data Terminal Ready 1 – Indicates port is powered, initialized, and
			ready. Used as hardware handshake with DSR1 for overall readiness.
5	GND	J4-9	Ground
6	DSR1*	J4-2	Data Set Ready 1 – Indicates external serial device is powered,
			initialized, and ready. Used as hardware handshake with DTR1 for
			overall readiness to communicate.
7	RTS1*	J4-4	Request To Send 1 – Indicates serial port is ready to transmit data.
			Used as hardware handshake with CTS1 for low level flow control.
	TX1+		Transmit Data 1 Positive – If in RS485 mode, this pin is TX1+.
8	CTS1*	J4-6	Clear To Send 1 – Indicates external serial device is ready to receive data.
			Used as hardware handshake with RTS1 for low level flow control.
	RX1+		Receive Data 1 Positive – If in RS485 mode, this pin is RX1+.
9	RI1*	J4-8	Ring Indicator 1 – Indicates external serial device is detecting a ring
			condition. Used by software to initiate operations to answer and open
			the communications channel.

Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.

To implement the two-wire RS485 mode on either serial port, you must tie the equivalent pins together for each port.

For example; on Serial Port 1, tie pin 2 (RX1-) to 3 (TX1-) and pin 7 (TX1+) to 8 (RX1+) at the (DB9) Serial 1 port connector (J7) as shown in Figure B-2. Refer to either table for the specific pins on the port connectors. The RS-422 mode uses a four-wire interface and does not need any pins tied together, but you must select RS-485 in BIOS Setup.

1 2 3 4 5

Standard DB9 Serial Port Connector (Female)

Rear View 6 7 8 9

CM800QkS_13a

Figure B-2. RS-485 Serial Port Implementation

28 QuickStart Guide CoreModule 800