N (usecs)
• USED WITH “FIXEDRTS” FLOW CONTROL ONLY.
• IF NON-ZERO, TRANSMITTER WILL WAIT UP TO N
MICROSECONDS FOR DCD TO GO LOW BEFORE
TRANSMITTING.
• USEFUL FOR IMPLEMENTING COLLISION-AVOIDANCE
WITH “DUMB” RADIO-MODEMS.
• IMPLEMENTED INTERNALLY IN MULTIPLES OF 208 MICROSECONDS.
N (halfbytes)
• MODIFIES MODBUS/RTU AND DF1 SERIAL RECEPTION BEHAVIOR.
DURING DATA PACKET RECEPTION, AFTER “N” HALF-BYTE TIME
PERIODS HAVE ELAPSED WITH NO FURTHER DATA RECEIVED, THEN
END-OF-PACKET IS ASSUMED. DOES NOT AFFECT MODBUS/ASCII OR
ADAM-4000 RECEPTION BEHAVIOR.
• MODIFYING THIS SETTING MAY IMPROVE RECEPTION RELIABILITY
WHEN USING AN UNCONDITIONED (EG. BELL-202) RADIO-MODEM.
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