Host Interface 39 (114)
Pin Signal Name Pin Type Description/Comments
3 TX / OM3 O, I Transmit Output
• Direction: CompactCom -> Host application
• Idle state = High
This pin doubles as OM3 strapping input on Anybus
CompactCom M40 modules. Connect a pull-up resistor on the
application for this pin in serial mode.
36
11
35
OM0
OM1
OM2
I Operating mode [OM2, OM1, OM0]:
001 Serial 19.2 kbps
010 Serial 57.6 kbps
011 Serial 115.2 kbps
100 Serial 625 kbps
For more information see Operating Modes, p. 16.
27
2
MI0/SYNC
MI1
O See Module Identification, p. 17".
26
25
MD0
MD1
O See Module Detection, p. 16 .
8 RESET I See RESET (Reset Input), p. 18".
It is important to connect all signals correctly for proper functioning of the serial interface.
3.6.3 Baud Rate Accuracy
As with most asynchronous communication devices, the actual baud rate used on the Anybus
CompactCom may differ slightly from the ideal baud rate.
The baud rate error of the module is less than ±1.5%. For proper operation, it is recommended
that the baud rate accuracy in the host application lies within ±1.5% from the ideal value.
Anybus
®
CompactCom
™
M40 Hardware Design Guide HMSI-216-126 EN 2.6
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