Meggitt VM600 Hardware Manual

13 - 4 VM600 MPS hardware manual (standard version) MAMPS-HW/E
Edition 17 - February 2018
Configuring A and B serial communications
CONFIGURATION OF CPUM / IOCN CARDS
13.3Configuring A and B serial communications
An optional serial communications module (AIM104-COM4 or equivalent) can be fitted to the
CPUM card in order to support additional serial connections that can be used to configure
multi-drop RS-485 networks of VM600 racks.
Additional serial communications (RS-485) via the group ‘A’ (two connectors) and group ‘B’
(two connectors) on the IOCN card’s panel can be configured as either half-duplex (2-wire)
or full-duplex (4-wire) using jumpers on the serial communications module itself.
As shown in Figure 13-5, Figure 13-6, Figure 13-7 and Figure 13-8, jumper groups LK1, LK2,
LK3, LK4, LK5, LK6, LK7 and LK8 are used to configure factory settings and do not need to
be changed by the user.
Jumper group LK6 is used to configure the serial communications module (AIM104-COM4 or
equivalent) for operation with different versions of the CPUM card. LK6 (AB0) must be
removed for later versions of the CPUM card fitted with the PFM-541I or equivalent CPU
module, or LK6 (AB0) must be inserted for earlier versions of the CPUM card fitted with the
MSM586EN or equivalent CPU module.
Jumper groups LK9 and LK11 are used to configure RS-485 communications for connector
group A and jumper goups LK10 and LK12 are used to configure RS-485 communications
for connector group B.
Jumper groups LK13 and LK15 are used to configure the terminations for connector group A
and jumper goups LK14 and LK16 are used for connector group B.
NOTE: The configuration of each communication port (connector groups A and B) can be
set independently. For example, connector group A can be configured as
half-duplex and connector group B configured as full-duplex (or vice versa) at the
same time.
The jumper settings for half-duplex or full-duplex RS-485 communications are very similar.
The only difference is that in full-duplex mode, jumpers LK9 and LK10 must be changed.
13.3.1 RS-485 selection, half-duplex (2-wire) configuration
The serial communications module (AIM104-COM4 or equivalent) jumper settings to select
half-duplex RS-485 communications for the A and B connectors depends on the version of
the CPUM card being used:
• For later versions of the CPUM card fitted with the PFM-541I or equivalent CPU module,
the jumpers and terminations should be set as shown in Figure 13-5.
• For earlier versions of the CPUM card fitted with the MSM586EN or equivalent CPU
module, the jumpers and terminations should be set as shown in Figure 13-6.
13.3.2 RS-485 selection, full-duplex (4-wire) configuration
The serial communications module (AIM104-COM4 or equivalent) jumper settings to select
full-duplex RS-485 communications for the A and B connectors depends on the version of the
CPUM card being used:
• For later versions of the CPUM card fitted with the PFM-541I or equivalent CPU module,
the jumpers and terminations should be set as shown in Figure 13-7.
• For earlier versions of the CPUM card fitted with the MSM586EN or equivalent CPU
module, the jumpers and terminations should be set as shown in Figure 13-8.

Meggitt VM600 Specifications

General

Brand	Meggitt
Model	VM600
Category	Measuring Instruments
Language	English