Serial Connector, P2, Signal Names And Functions - Elo TouchSystems IntelliTouch SecureTouch Manual

Table B.4

Serial Connector, P2, signal names and functions

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