Quatech MPA-200/300, RS-422/485 user manual J8 Synca to Rlen control, Synca Rlen OUT

Table 10 Jumper block J7 connections

Driver Control Function	Pins
Transmitter Always Enabled	1&2
Transmitter controlled by Comm. Register	2&3
Receiver Always Enabled	4&5
Receiver controlled by Comm. Register	5&6

4.6J8 - SYNCA to RLEN control

J8 controls the signal path from the RLEN bit in the Communications register to the SYNCA input to the SCC. If J8 is installed the RLEN bit may be used to control the SYNCA pin when the SCC is in external SYNC mode. Note: the RLEN output is still effected when used to control the SYNCA pin.

Table 11 Jumper J8 Selections

Function	Jumper J8
SYNCA	IN
RLEN	OUT

Quatech Inc., MPA-200/300 Manual 14