
TREK-550/303 User Manual 26
5.6 RS-232 (COM9) / RS-485 (COM5) / J1708 (COM6)
Connector
5.7 DI / DO Connector
Table 5.4: RS-232 / RS-485 / J1708 Connector
Pin Signal Pin Signal
1 RS-232 RTS 2 RS-232 RXD#
3 RS-232 TXD 4 RS-232 CTS
5 Ground 6 RS-485 D-
7 RS-485 D+ 8 J1708 D-
9 J1708 D+
Table 5.5: DI / DO Connector
Pin Signal Pin Signal
1 Isolated Dry Contact Input 1 2 Isolated Dry Contact Input 2
3
Isolated Dry Contact Input 3
/Speed signal input for DR*
4
Isolated Dry Contact Input 4
/Forward signal input for DR*
5 Isolation Ground 6 Isolated Relay Driver Output 1
7 Isolated Relay Driver Output 2 8 Isolated Relay Driver Output 3
9 Isolated Relay Driver Output 4
Note! Regarding the setting of Pin3/4, please refer paragraph 4.2.5 (DI/GPS
Function Selection ).
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