B&B Electronics MES1A User Manual
Page 67
RS-232
Connections
Manual Documentation Number: MES1A/MES1B-2106m PN7138-rev001
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com
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DB-9M
Pin
Signal RS-232
DTE
2
Receive Data
RXD
In
3 Transmit
Data
TXD
Out
5 Signal
Ground
GND ---
Figure 37.
RS-232 Connections for DB-9 Connector
Signal Name
Label
Direction
Terminal
Receive Data (+)
RDB(+)
In
1
Receive Data (-)
RDA(-)
In
2
Transmit Data (+)
TDB(+)
Out
3
Transmit Data (-)
TDA(-)
Out
4
Signal Ground
GND
---
5
Figure 38.
MES1B Terminal Block Pin-out for RS-422/485 Four-Wire
Operation