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SHM-B ASYNC
Pins 4, 5, 6, 8, and 20 should all be HIGH to enable
communication.
5. If pin 8 (Carrier Detect) is low, this indicates:
• a defective transmission line or connection
• a defective remote SHM-B
• remote SHM-B without power
SYMPTOM: TD and RD LEDs indicate data activity, but
data communication doesn’t exist.
1. Check the wiring of the EIA-232 port. Refer to Section
3.2 for information.
2. Check the setting of S1. Refer to Section 3.3 for
information.
SYMPTOM: Transmitted and/or received data is full of
errors (garbled data).
1. Check for reversal of polarity on the four-wire
connection. Refer to Section 3.1 and Figure 2.
2. Check word structure and speed settings on your