Figure 2-9. Connector Pin-Outs For Rs-232 Mode - Teledyne T750 User Manual

USB O
PTION
For direct communication between the instrument and a personal computer (PC), connect
a USB cable between the instrument and desktop or laptop USB ports. (If this option is
installed, the COM2 port can only be used for RS232 multidrop communication).
Computer and instrument baud rates must match (Setup>Comm>COM[1, 2] menu,
Section 3.3.11.1.
RS-232
AND
For RS-232 communications with data terminal equipment (DTE) or with data
communication equipment (DCE) connect either a DB9-female-to-DB9-female cable
(Option 60B) or a DB9-female-to-DB25-male cable (Option 60A), as applicable, from the
communications and output panel RS-232 port to the device.
Important
RS-232 C
OM
Electronically, the difference between the DCE and DTE is the pin assignment of the Data
Receive and Data Transmit functions.
•
•
Teledyne API offers two mating cables, one of which should be applicable for your use:
P/N WR000077, a DB-9 female to DB-9 female cable, 6 feet long. Allows
connection of the serial ports of most personal computers.
P/N WR000024, a DB-9 female to DB-25 male cable. Allows connection to the
most common styles of modems (e.g. Hayes-compatible) and code activated
switches.
083730750B DCN8606
C
ONNECTION
RS-485 C
ONNECTION
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 2-9) before using.
P C P
ORT ONNECTOR IN
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 2-9. Connector Pin-Outs for RS-232 Mode

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OUTS
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