Teledyne M300EM 1:Default Pin Assignments for Back Panel COMM Port connectors RS-232DCE & DTE

Remote Operation Teledyne API – Technical Manual - Model 300E Family CO Analyzers

Male DB-9 (RS-232)

(As seen from outside analyzer)

TXD

	GND
RXD

1 2 3 4 5

6 7 8 9

RTSCTS

(DTE mode)

RXD

	GND
TXD

1 2 3 4 5

6 7 8 9

CTSRTS

(DCE mode)

Female DB-9 (COM2)

(As seen from outside analyzer)

TXD

	GND
RXD

1 2 3 4 5

6 7 8 9

RTSCTS

(DTE mode)

Figure 8-1: Default Pin Assignments for Back Panel COMM Port connectors (RS-232 DCE & DTE)

The signals from these two connectors are routed from the motherboard via a wiring harness to two 10-pin connectors on the CPU card, J11 (RS-232) and J12 (COM2).

Figure 8-2: Default Pin Assignments for CPU COM Port connector (RS-232)

Teledyne API offers two mating cables, one of which should be applicable for your use.

∙Part number WR000077, a DB-9 female to DB-9 female cable, 6 feet long. Allows connection of the serial ports of most personal computers. Also available as Option 60 (see Section 5.7.1).

∙Part number 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.

Both cables are configured with straight-through wiring and should require no additional adapters.

NOTE

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 before using.

To assist in properly connecting the serial ports to either a computer or a modem, there are activity indicators just above the RS-232 port. Once a cable is connected between the analyzer and a computer or modem, both the red and green LEDs should be on.

∙If the lights are not lit, use small switch on the rear panel to switch it between DTE and DCE modes.

∙If both LEDs are still not illuminated, make sure the cable properly constructed.

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