TREK-753 User Manual 54
32 RS232_RI
RS-232 male connector
9
33 RS232_CTS 8
34 RS232_RTS 7
35 RS232_DSR 6
36 GND(Drain wire) 5
37 RS232_DTR 4
38 RS232_TXD# 3
39 RS232_RXD# 2
40 RS232_DCD 1
41 N/A
42 ISO_DO4
DIO & RS-485
DB15 female connector
12
43 ISO_DO3 11
44 ISO_DO2 10
45 ISO_DO1 9
46 ISO_DI4 4
47 ISO_DI3 3
48 ISO_DI2 2
49 ISO_DI1 1
50 GND_ISO (26AWG) 5
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