User Guide

Teledyne API M100E Analyzer Operation Manual Remote Operation and Advanced Features
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To reconfigure COM2 as an RS-485 port:
1. Locate J32 and move the shunt from Pins 1  2 to Pins 3  4.
2. Remove the connector from J12.
3. Plug the RS-485 connector into J15.
Figure 7-5: CPU RS-485 Setup
When COM2 is configured for RS-485 operation the port uses the same female DB-9 connector on the back of
the instrument as when COM2 is configured for RS-232 operation, however, the pin assignments are different.
Female DB-9 (COM2)
(As seen from outside analyzer)
(RS-485)
1 234 5
6 7 8 9
GND
RX/TX
+
RX/TX
-
Figure 7-6: Rear Panel Connector Pin-Outs for COM2 in RS-485 Mode
The signal from this connector is routed from the motherboard via a wiring harness to a 3-pin connector on the
CPU card, J15.
04515F DCN6048