Quatech DS-200/300 user manual Termination Resistors, RS-422/485 Peripheral Connection

7.7 Termination Resistors

Optional line termination resistors are provided for the input signals of each of the DS-200/300’s RS-422/485 ports. The user has the option of selecting RS-422 termination (￿￿￿￿), RS-485 termination (120￿), or no termination. Line termination may be selected or removed using jumper block J1. The board is shipped with no termination selected.

SIGNAL	CHANNEL	TERM SIZE	PINS
			JUMPERED ON
			J1
RXD	Serial 0	100￿	1-9
		120￿	2-10
AUXIN	Serial 0	100￿	3-11
		120￿	4-12
RXD	Serial 1	100￿	5-13
		120￿	6-14
AUXIN	Serial 1	100￿	7-15
		120￿	8-16

Figure 24 --- RS-422/485 Line Termination

J1	8	7	6	5	4	3	2	1
	16	15	14	13	12	11	10	9

Figure 25 --- Line Termination Option Block

7.8 RS-422/485 Peripheral Connection

The DS-200/300 connects to peripheral equipment through two female D-9 connectors. The serial port connector definitions are listed in Figure 28.

DS-200/300 User's Manual 7-6