B-73
Table B.4
Serial Connector, P2, signal names and functions
Signal electrical characteristics are given in the following table. These
specifications comply with ANSI/EIA/TIA 232-E.
Table B.5
Serial signal electrical characteristics
Signal Name
DB-9
P2 pin
Sourced by
Signal Function
-DCD
1
1
ctrl
“carrier detect”, handshake=’0’ when controller power
on
-DSR
6
2
ctrl
“data set ready”, handshake=’0’ when controller power
on
RXD
2
3
ctrl
serial data from controller to host
-RTS
7
4
host
“ready to send”, handshake=’0’ when controller may
send
TXD
3
5
host
serial data from host to controller
-CTS
8
6
ctrl
used as “ready to receive”, handshake=’0’ when host
may send
-DTR
4
7
host
ignored
RI
9
8
n/u
not used
SG
5
9
com
signal ground
n/u
n/c
10
n/u
connector key
Parameter
Value
Applicable Signals
1
1. Signals defined in Table 1. Serial Connector, P2, signal names and functions
EIA-232 subsec.
Minimum ON state input voltage
2
2. Measured with respect to circuit SG, Signal Ground.
+3 volts
TxD, RTS, DTR
2.1.3
Minimum OFF state input voltage
2
-3 volts
TxD, RTS, DTR
2.1.3
DC Load Resistance, receiver
5 k_ ± 2 k_
TxD, DTR
2.1.4
DC Load Resistance, RTS
1.75 k_ ± 500 _
RTS
2.1.4
Source Impedance (Power Off)
> 300 _
DSR, DCD,CTS, RxD
2.1.5
Power-off condition interpretation
ON condition
RTS, DTR
2.1.5
Output Voltage, Open Circuit
25 volts, max.
3
3. Absolute magnitude.
RxD, DSR, DCD, CTS
2.1.6
Output Voltage into test load
4
4. Output voltage measured over the entire range of test load from 3000 ohms to 7000 ohms.
>5 volts;
<15 volts
3
RxD, DSR, DCD, CTS
2.1.6
Short Circuit Current
<100 mA
RxD, DSR, DCD, CTS
2.1.6
Transition Characteristics
per EIA-232-E
RxD, DSR, DCD, CTS
2.1.7
Summary of Contents for IntelliTouch SecureTouch
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