2-18
2
TABLE 2-3 4819A SIGNAL ASSIGNMENTS
Rear Panel Connector J2 Internal Connector J3
Pin #
Signals Signal Signals Pin #
DE-9P Direction
DE-9S
1
DCD
+V
DCD
1
2
TxD
←
TxD *
2
3
RxD
→
RxD *
3
4
DTR +V
DTR
4
5
GND
−
GND
5
6
DSR
DSR
6
7
RTS +V
RTS
7
8
CTS
CTS
8
9
nc
−
nc
9
Notes:
1. +V is + 9 Vdc through a 3.3 kohm resistor.
2. * Standard setting. TxD and RxD can be switched by setting jumper
W4 to the DTE position.
2.9.2.2 4819A Internal Connector J3
Internal connector J3 is a DE-9S connector with DCE type signal assign-
ments. Signal RxD on pin 3 is the output to the internal serial device. Signal
TxD on pin 2 is driven by the internal serial device. The RxD and TxD pins
can be exchanged by rotating jumpers W4 90 degrees. DCD and DSR are
pulled up to an ‘ON’ state and RTS is jumpered back to CTS.
2.9.3 4829A Serial Connections
The 4829A has two right-angle 9-pin connectors for its serial interfaces.
Connector J2 is the external RS-232 serial connector that protrudes through
the rear panel. Connector J3 is the internal RS-485 serial connector for
connecting the 4829A to the serial device. Signal pin assignments for both
connectors are shown in Table 2-4.
2.9.3.1 4829A Rear Panel Connector J2
Rear panel connector J2 is a DE-9P connector with DTE type signal as-
signments similar to the signals in a PC COM port. Signal TxD on pin 2 is
the output signal and RxD on pin 3 is the input signal. RTS and DTR are
pulled high to the ‘ON’ state. DTR is internally jumpered to CTS.
Содержание 4809A
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