Appendix E: Backward Compatibility
58 (70)
E.2.4
Host Application Interface
25
50
1
26
MD1 A1 A3 A5 A7 A9 A11 A13 D6 D4 D2 D0 VDD VSS OM1 CE IRQ RESET GOP0 GIP0 LED2B LED1B Tx/OM3 MI1 VSS
VSS A0 A2 A4 A6 A8 A10 A12 D7 D5 D3 D1 VDD VSS OM0 OM2 R/W OE GOP1 GIP1 LED2A LED1A
Rx MI0 MD0
Fig. 7
Some signals in the host application interface have modified functionality and/or functions which
must be checked for compatibility. See the following sections.
Tx/OM3
This pin is Tx only in the 30-series. It is tri-stated during power up, and driven by the Anybus
CompactCom UART after initialization. In the 40-series this pin is used as a fourth operating
mode setting pin (OM3). During startup after releasing the reset, this pin is read to determine
the operating mode to use. The pin is then changed to a Tx output.
In the 40-series, this pin has a built-in weak pull-up. If this pin, on a 30-series module or brick is
unconnected, pulled high, or connected to a high-Z digital input on the host processor, it will be
compatible with the 40-series. An external pull-up is recommended, but not required.
If this pin is pulled low by the host during startup, the 40-series module or brick will
not enter the expected operating mode.
Related Information: Anybus CompactCom M40 Hardware Design Guide (HMSI-216-126), Sec-
tion “Application Connector Pin Overview”
Module Identification (MI[0..1])
These pins are used by the host application (i.e your product) to identify what type of Anybus
CompactCom that is mounted. The identification differs between the 30-series and the 40-
series.
If your software use this identification you need to handle the new identification value.
MI1
MI0
Module Type
LOW
LOW
Active Anybus CompactCom 30
HIGH
LOW
Active Anybus CompactCom 40
MI[0..1] shall only be sampled by the application during the time period from power up to the
end of SETUP state. The pins are low at power up and before reset release.
Related Information: Anybus CompactCom M40 Hardware Design Guide (HMSI-216-126), Sec-
tion “Settings/Sync”.
Anybus
®
CompactCom
™
40 Modbus-TCP
®
Transparent Ethernet Network Guide
SCM-1202-022 1.1