ICS ELECTRONICS 4809A, Instruction Manual

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TABLE 2-4 4829A SIGNAL ASSIGNMENTS
Rear Panel Connector J2 Internal Connector J3
Pin # Signals Signal Signals Pin #
DE-9P Direction DE-9S
1 DCD RD(B) 1
2 TxD
←
RD(A) 2
3 RxD
→
SD(A) 3
4 DTR +V SD(B) 4
5 GND
−
GND 5
6 DSR nc 6
7 RTS +V nc 7
8 CTS nc 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.
2.9.3.2 4829A Internal Connector J3
Internal connector J3 is a DE-9S connector with SD and RD differential signal
pairs. The SD and RD signal pairs are a four-wire, full-duplex interface.
The SD and RD signal pairs can be jumpered together on the 4829A board
for half-duplex operation by installing jumpers W4 and W5.
2.9.4 4899A Serial Connections
The 4899A’s serial port is a DTE (Data Terminal Equipment) interface on a
DB-25S female connector. The connector has both RS-232 and RS-422/RS-
485 signals in accordance with EIA-STD - RS-530. RS-232 and RS-422
(RS-485) signal selection is made by setting jumpers inside the 4899A.
Refer to section 2.10 for jumper setting instructions. Table 2-2 shows the
4899A’s signal-pin assignments and signal directions.