ICP DAS USA I-7540D - Manual (Page 12)

2.2.1 RS-232 & RS-485 & Power supply Interface
The I-7540D provides one RS-232 interface and one RS-485 interface with
hardware flow control. The GND-signal of COM1 is shared with pin-9, GND. The pin
assignment is shown in table 2-1.
Table 2-1: COM Connector Pin Assignment
Pin Name Description
1 CTS1 CTS pin of COM1 (RS-232)
2
RTS1 RTS pin of COM1 (RS-232)
3 RXD1 RXD pin of COM1 (RS-232)
4 TXD1 TXD pin of COM1 (RS-232)
5 INIT*
Initial pin for enable/disable
AUTOEXEC.BAT
6 D2+ Data+ pin of COM2 (RS-485)
7 D2- Data- pin of COM2 (RS-485)
8 VS+
V+ of power supply
(+10V to +30V DC unregulated)
9 GND GND of power supply
i-7540D CAN-Ethernet Gateway User’s Manual (Version 1.4, April/2008) 12