Appendix B
I/O Interface Board Description
CoreModule 740
Reference Manual
37
12
DSR2*
J5-23
Serial Data Set Ready 2 – Indicates external serial communications
device is powered, initialized, and ready. Used as hardware handshake
with DTR2 for overall readiness to communicate.
13
RXD2
J5-25
Serial Receive Data 2 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 RTS2 line to allow the
transmission to complete.
14
RTS2*
J5-27
Serial Request To Send 2 – Indicates serial port is ready to transmit
data. Used as hardware handshake with CTS2 for low level flow
control.
15
TXD2
J5-29
Serial Transmit Data 2 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 transmitting data on this
line.
16
CTS2*
J5-31
Serial Clear To Send 2 – Indicates external serial communication
device is ready to receive data. Used as hardware handshake with
RTS2 for low level flow control.
17
DTR2*
J5-33
Serial Data Terminal Ready 2 – Indicates port is powered, initialized,
and ready. Used as hardware handshake with DSR2 for overall
readiness to communicate.
18
RI2*
J5-35
Serial Ring Indicator 2 – Indicates external modem is detecting a ring
condition. Used by software to initiate operations to answer and open
the communications channel.
19
GND
J5-37
Digital Ground
20
TXD2_
TTL
(NF)
J5-39
Serial Port 2 Transmit TTL – Places TTL TX signals on pin 3 of the
Serial Port 2 (J4) when jumper (W1) on I/O Interface Board is set to
pins 2-3. (NF = No function at the CoreModule 740.)
21
USB PS0
J5-41
Power sense – The voltage network monitors power and disables port
if this input is low. Direct power input through fuse on I/O Interface
Board provides over current protection.
22
USB
PWR
J5-43
USB Port 0 power (+5V +/-5%)
23
USB P0-
J5-45
Universal Serial Bus Port 0 Data –
24
USB P0+
J5-47
Universal Serial Bus Port 0 Data +
25
GND
J5-49
USB Ground
26
USB PS1
J5-51
Power sense – The voltage network monitors power and disables port
if this input is low. Direct power input through fuse on I/O Interface
Board provides over current protection.
27
USB
PWR
J5-53
USB Port 0 power (+5V +/-5%)
28
USB P1-
J5-55
Universal Serial Bus Port 1 Data –
29
USB P1+
J5-57
Universal Serial Bus Port 1 Data +
30
GND
J5-59
USB Ground
31
MS Dta
J5-61
Mouse Data
32
MS Clk
J5-63
Mouse Clock
33
GND
J5-65
Ground
34
MS Pwr
J5-67
Mouse Power (+5V +/-5%)
Table B-1. Utility 1 Interface Pin Signals (J1) (Continued)