32 Getting Started 083730300A DCN8101
RS-232 CONNECTION
For RS-232 communications with data terminal equipment (DTE) or with data
communication equipment (DCE) connect either a DB9-female-to-DB9-female cable
(Teledyne API part number WR000077) or a DB9-female-to-DB25-male cable (Option
60A), as applicable, from the analyzer’s rear panel RS-232 port to the device. Adjust the
rear panel DCE-DTE switch (Figure 2-2) to select DTE or DCE as appropriate.
Configuration: Section Section 3.2.1 and/or Section 3.4.2 (for Hessen protocol).
IMPORTANT
IMPACT ON READINGS OR DATA
Cables that appear to be compatible because of matching
connectors may incorporate internal wiring that makes the
link inoperable. Check cables acquired from sources other
than Teledyne API for pin assignments (Figure 2-11) before
using.
RS-232 COM PORT CONNECTOR PIN-OUTS
Electronically, the difference between the DCE and DTE is the pin assignment of the
Data Receive and Data Transmit functions.
• DTE devices receive data on pin 2 and transmit data on pin 3.
• DCE devices receive data on pin 3 and transmit data on pin 2.
Figure 2-11. Rear Panel Connector Pin-Outs for RS-232 Mode
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