Elo TouchSystems IntelliTouch SecureTouch Signal Name DB-9 P2 pin Sourced by Signal Function

Table B.4 Serial Connector, P2, signal names and functions

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

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	Value	Applicable Signals1	EIA-232 subsec.
Minimum ON state input voltage2	+3 volts	TxD, RTS, DTR	2.1.3
Minimum OFF state input voltage2	-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	RxD, DSR, DCD, CTS	2.1.6
Output Voltage into test load4	>5 volts;	RxD, DSR, DCD, CTS	2.1.6
	<15 volts3
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

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.

B-73