Comtech EF Data DMD2401/DMD2401L - Manual (Page 161)

Electrical Interfaces DMD2401/DMD2401L/DMD2401 IBS/IDR Satellite Modem
5-22 TM065 – Rev. 3.3
Table 5-19. Asynchronous Interface - 9-Pin Female “D” Connector (J17)
Pin Number Signal Description Direction
1 TX-485-B Transmit Data RS485 (+) Input
2 TXD-232 Transmit Data RS232 Input
3 RXD-232 Receive Data RS232 Output
5 GND Ground –
4 NC Not Connected –
9 RX-485-A Receive Data 485 (-) Output
8 RX-485-B/CTS Receive Data 485 (+) Output
6 TX-485-A Transmit Data 485 (-) Input
7 RTS Request to Send Input