Purpose
Allocates a specified channel device from the operating system.
Syntax
where:
- cpname
- Pair of database communication devices specified as CPnnnn, where nnnn is the device number of the even-numbered device. Either three or four hexadecimal digits can be specified.
Usage Notes
The devices for an CP can be either explicitly or dynamically allocated. Dynamic allocation by TDP is the normal choice since only the ATTACH command is required. Explicit allocation requires that the following be performed before the ATTACH command is issued:
| If using this operating system | Do the following |
|---|---|
| z/OS | In the JCL procedure used to start TDP, include one DD statement for each of the two devices for the CP. Each is of the form: //CPnnnn DD UNIT=nnn In one DD statement the nnn is the even device. In the other DD statement the nnn is the odd device number. For four-digit device numbers, z/OS requires that the UNIT parameter contain a slash as in UNIT=/nnnn |
Before TDP uses the CP, a START command for that CP and a RUN command must be issued and complete.
Example: ATTACH CP
ATTACH CPC308
Completion Message
The following message confirms that the command has been validated:
TDP1356 ATTACH COMMAND ACCEPTED FOR CPC308
The following message subsequently confirms that the command has been completed:
TDP1356 "CPC308" HAS BEEN ATTACHED