MEN BL51E, User Manual

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Functional Description
20BL51E00 E2

2020-03-27 Page 68
3.20 RS232
The BL51E supports:

Data rate:
- up to 115.2 kbit/s

60-byte transmit buffer

60-byte receive buffer

Handshake lines: CTS/RTS

Usable as serial console
3.20.1 Rear Connection
Table 49. Connector types – 9-pin D-Sub plug
Table 50. Pin assignment – RS232 (9-pin D-Sub plug)
Table 51. Signal mnemonics – RS232
Connector Type
On BL51E 9-pin D-Sub plug according to DIN41652/MIL-C-24308, with thread bolt
UNC 4-40
Mating 9-pin D-Sub receptacle according to DIN41652/MIL-C-24308
6 - 1 -
7 RTS# 2 RXD
8 CTS# 3 TXD
9 - 4 -
5 GND
Signal Direction Function
GND - Ground
CTS# in Clear to send
RTS# out Request to send
RXD in Receive data
TXD out Transmit data
5
9
1
6