![background image](http://html.mh-extra.com/html/advantech/bb-vesp211-series/bb-vesp211-series_user-manual_2858006060.webp)
BB-VESP211x Serial Servers
:
60
APPENDIX D: CONNECTOR PINOUTS
DB9M CONNECTOR
DB9M Pin
RS-232
Direction (RS-232)
RS-422/485 4-Wire
RS-485 2-Wire
1
DCD Input
RDA
(-)
---
2
RD Input
RDB
(+)
---
3
TD
Output
TDB (+)
Data B (+)
4
DTR
Output
TDA (-)
Data A (-)
5
GND ---
GND
GND
6
DSR Input
---
---
7
RTS Output
---
---
8
CTS Input
---
---
9
--- ---
---
---
TERMINAL BLOCK
Terminal
RS-422
RS-485
A
TDA (-)
Data A (-)
B
TDB (+)
Data B (+)
C
RDA (-)
---
D
RDB (+)
---
E
GND GND