Comtech EF Data SMS-301 - Manual (Page 37)

SMS-301 Redundancy Switch Installation
Rev. 3 2–15
2.3.7 Switch/Modem Communications Interface Connector (J13)
The switch/modem communications interface (J13) connector is described in the
following listings and pinout data is included in Table 2-13.
Interface type:
• EIA-485 (2-wire)
• Baud rate range 9.6 or 19.2 kbit/s
• ASCII characters
• 11 bits per character:
! 7 information bits
! 2 stop bits
! 1 parity (Even)
! 1 start bit
Table 2-13. Switch/Modem Communications
Interface Connector (J13)
Pinout
Pin # Name (2-Wire)
1 GND
2
3
4
+TX, +RX
5 -TX, -RX
6
7
8
+RX, +TX
9 -RX, -TX