Model 6220/6221 Reference Manual Remote Operations 10-27
Return to Section 10 topics
RS-232 connections
The RS-232 serial port can be connected to the serial port of a computer using a
straight-through RS-232 cable terminated with DB-9 connectors. Do not use a
null modem cable. The serial port uses the transmit (TXD), receive (RXD), ready
to send (RTS), clear to send (CTS), and signal ground (GND) lines of the RS-232
standard. Figure 10-4 shows the rear panel connector for the RS-232 interface
and Tab le 1 0 - 5 shows the pinout for the connector. The connector location on the
rear panel is shown in Figure 10-3.
Figure 10-4
RS-232 interface connector
If your computer uses a DB-25 connector for the RS-232 interface, you will need a
cable or adapter with a DB-25 connector on one end and a DB-9 connector on the
other, wired straight through (not null modem). Table 10-6 provides pinout identifi-
cation for the 9-pin (DB-9) or 25-pin (DB-25) serial port connector on the computer
(PC).
Table 10-5
RS-232 connector pinout
Pin number Description
1 No connection
2 TXD, transmit data
3 RXD, receive data
4 No connection
5 GND, signal ground
6 Not used
7 RTS, ready to send
8 CTS, clear to send
9 No connection
9876
54321
Rear Panel Connector
RS232
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com
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